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Yes, you can over cook meat in a pressure cooker.
Are you leaving the thighs intact? If yes, use skinless thighs, but bone in will offer a flavor bump over boneless. As to the timing, if they're palm sized (think playing cards, a deck to a deck and half in size), then 20 minutes will be about right. If they're larger, (2 decks or more) you'll probably need a few more minutes.
You might find some of these useful. There is a learning curve to pressure cookers.
certainly the meat will be over cooked if not removed in time.finally the steam will g out and the meat will start to burn inside.in a pressure cooker rice gets cooked 1/3 the amount of time as that of open flame cooking.you can google and find the time you want to keep your meat in the cooker easily with a lot of recipes online.