Repeat this mantra: Pressure canners are good, Pressure canners are safe. . .
Good, because they shelf stabilize food, no freezer, no drying, no sugaring, no pickling. Safe because modern pressure canners are built with a special seal that will fail before anything drastic happens.
Remember, pressure canners are tools. Educate yourself about your tool. Have a good book that covers pressure canning ("The Ball Blue Book", "So Easy To Preserve"). Figure out what your altitude adjustment is and write it on the inside front cover of the book so you always have it. Just as one wouldn't drive a car without proper instructions, nor fly a plane without learning how from lessons, a person needs to learn about and follow proper USDA instructions for pressure canning.
Always have the instructions with you, always review and refer to them (never rely on memory, always have the book as back up) every time you pressure can, always *follow the instructions* (!!!!!), NEVER take shortcuts of any sort, and you will always have a safe and happy pressure canning experience.
Right now I am canning a full load (18 pints) of pork shoulder in chunks; it should be done in about half an hour. I am looking forward to making bbq pork sandwiches, pork ragu, pork curry, pork stew, pork tacos, pork burritos--all gooooood stuff.
The last pressure canner batch I did was a full load of chunk, boneless, skinless, chicken leg meat. It is very chicken-y and delicious and beats anything I can buy at the store.
You can do it. Keep telling yourself that you can do it! Learn and put it to use!
I hope you have many years of delicious pressure canning!
BTW, I have been considering getting a smaller pressure canner, one that might do 8--9 pints on one rack. This is because, like you, my freezer is full and I always have a LOT of spaghetti sauce (your "gravy") sauce leftover. It sure would be nice to be able to crack open a pint of the stuff for my husband in-between cooking the big batches fresh!