Sounds to me as though
you are stressing out far too much. That sort of party should be fun for everyone, including the hostess.
What I find works is to put out a series of appetizers and starter courses.
Appetizers are among my favorite things, as you can really let your creativity and imagination run wild. Plus most of the work can be done ahead of time, and you get to enjoy your guests.
Recently I was asked to prepare some guidelines for appetisers. They might serve you in good stead. Keep in mind my comments presumed a full meal to follow. So, in your case, just adapt them to mean the appetizer selection in total.
For starters (yes, I do have a punning license), let's look at some concepts, rather than just running a list of recipes.
Appetisers should be small, easily handled, and tasty. The whole idea is to get the juices flowing, to prepare the stomach for the feast ahead (if there's going to be one). Appetisers should also promote good conversation among the guests.
Just as with the main dish, itself, you want appetisers to compliment the flavors of what's to come, rather than conflict with them. Typically (but not always) this means a totally different type of food. If you're serving beef as the main course, appetisers should be fish, or fowl, or straight vegetarian most times. A hot (as in spicy) main course should not be preceeded by a hot appetiser. And so forth. (You can ignore this part for a buffet)
Give some thought to how you can convert main dish recipes you already are comfortable with into bite-sized morsals. Do that, and you have an incredible repetory of possibilities. You'll find that your small cookie cutters can be invaluable in this regard. With them, you can create equal-sized pieces of chicken breast or fish filets, or shape forcemeat, or cut pastry, veggies, etc.
Got a favorite meatball recipe? Reduce the balls to the size of marbles, and poof! There's an appetiser.
Won ton wrappers can be an invaluable aid to preparing appetisers. Use them as designed, to wrap around foodstuffs. Or combine two of them, to produce ravioli type dishes. Or bake them in muffin tins, to create individual, edible serving cups you can then fill with whatever.
Here are ways to use each method:
Pan fry some ground pork with appropriate spices. Add some chopped onion, grated cabbage, and bean spouts. Let cool. Fill a won ton wrapper, fold over, and fry. Or go the whole potsticker route.
Make a mushroom filling and sandwhich it between two wrappers. Cut into rounds and either boil or fry. Alternatively, dip the whole thing into an egg wash, then into bread crumbs, and bake at 350 until golden.
Fill a baked won ton cup with guacomole. Top it with a sauteed shrimp and a sprig of cilantro.
Pate choux paste is one of the most versatile things going. When you make it sweet it's called puff paste, and used for things like profiteroles. When made savory, it's called gougere.
Instead of just dropping it by spoonfuls, use a pastry bag and large tube and pipe out different shapes: rounds, crescents, logs, etc. Then use a different filling with each shape. Maybe a gorgonzola chicken salad in one, spiced ham mash in another, smoked salmon spread in still a third. In each case, use a fancy toothpick and a signature garnish, i.e., green olives, black olives, cocktail onions, cherry tomatoes, etc.
Vertical presentations are almost always more appealing. So, while keeping the total amount small, pile things upwards. For instance, I make reduced-size lamb patties, which are placed on a maple-broiled sweet-potato round, and topped with minted aioli. A mint leaf finishes the whole thing.
Where appropriate, criss-cross items to build height, and use garnishes in a manner that accentuates the visible appeal as well as the taste. When cutting items, offset the cuts. Equal sized pieces are visually boring, and lack movement.
Finally, something every cook probably knows. But it bears repeating: Anything tastes better wrapped in bacon.
Here's one of my own appetisers you might find appealing. It's a classic case of reducing a main dish entree into a starter:
Mini-Hot Browns.
Hot browns were first served at the Brown Hotel, in Louisville, Kentucky, back in the '20s, and have become a staple in the Bluegrass State. Nowadays mostly served with a cheddar sauce and garnished with tomatoes, the original used a Morney sauce, and garnished with mushrooms.
Make a thick Mornay sauce: Saute 1-2 tbls minced onion in 3 tbls butter. Add 3 tbls flour and cook for another minute. Slowly pour in 2 cups heated cream, stirring. Add salt, pepper, flecks of parsley, and a dash of nutmeg, and let cook down until very thick. For each 2 cups of sauce add 2 egg yolks (tempering them first). Stir until reaching boiling point. Remove from heat and add 1/2 cup grated Parmesan and 1 tbls butter.
Cut bacon into lardings and fry until browned. Drain on paper towels and reserve.
Carve a small mushroom cap for each hot brown. Gently saute in butter.
Toast slices of bread (I prefer oatmeal bread for this). Using a 2 1/2-3" cookie cutter (I use a fluted one), cut the bread into rounds. Use the same cookie cutter to cut 1/4" thick slices of deli counter chicken breast into the same sized rounds. Make the same number as bread rounds. Then go down a size and cut an equal number of chicken rounds. Finally, cut out tiny buttons of chicken (I use a length of 1/2" pvc for this), making 3 for each big piece.
On each toast round lay a large piece of chicken. Then center a smaller round on it. Top that with 3 buttons, in a slightly overlapping triangle. Top with a dollop of Mornay sauce, sprinkle with Parmesan, and pop under the broiler until they sauce gets suntanned.
Decorate each tower with bacon lardings, and top with a mushroom cap.
Hope this helps.