I use my pressure cooker constantly for weeknight meals. I never use "pressure cooker" cookbook. Nearly any recipe that spends a long (read: an hour or more) time in a pot can be adapted for use in a pressure cooker.
I would avoid specific "Pressure Cooker" cookbooks. I find that they really don't focus on the food that you might want to eat. I would focus instead on making a few simple dishes and learning basic techniques. Then, you can basically make anything you want.
Also, my cooker is perfectly safe. It can't explode (there is a valve that releases excess pressure if it can't handle it). And it's impossible to open if there is any level of pressure inside (there is a safety switch that's activated by pressure).
Here are a few basic tips:
--Read the instruction booklet of your cooker carefully and understand exactly how it works.
--Start with this tip: Divide the amount of inactive (braising/simmering) time in a recipe by three, and use that for your time spent under medium-high pressure. For example, if a stew or soup requires an hour on the stovetop simmering, bring it to a simmer in the cooker and then put it under medium high pressure for 20 minutes and then quick release the pressure and you should be about done.
--Use the quick-release of pressure in the beginning until you really get the hang of it. Sometimes it's better to just let the pressure decrease naturally, off-heat, but quick-release always works. If it's not done, you can always go back for more.
Here's a basic technique that you can experiment with to learn to use it:
--Brown a seasoned cheap cut of meat in a little oil in the cooker. A hunk of pork shoulder, chuck roast, lamb shoulder chops, chicken thighs, whatever. It can be whole or cut-up.
--Remove the browned meat and sautee some seasoned mirepoix in the fat and fond from the meat.
--If you want a thicker gravy, coat the mirepoix with some flour and cook until the flour absorbs the fat.
--Cover with some liquid: stock/broth, wine, beer, water, coconut milk, whatever.
--Add herbs: bay leaf, thyme sprigs, you get the idea.
--Add back the meat and it's juices.
--Add anything else that might cook in the same amount of time as the meat. For example, a nice large hunk of whole chuck roast might cook in the same amount of time as a whole potato or big hunk of carrot. A thin chop would want the veggies to be cut smaller.
--Cook under medium high pressure for at least 15-20 minutes. The bigger the cut of meat, the longer it will take.
--Open, adjust seasoning, and enjoy. If you have the time, let it rest and de-fat it if it's not thickened.
From this basic technique you can make anything from pot roast to beer-braised pork shoulder with potatoes to chicken curry with thai eggplant.
Using a pressure cooker is a little like using a smoker. It takes a little finesse and learning your way around your equipment, but it's a great, versatile tool that will save you tons of time and money.
Best,
Michael