Having the right set, setting and intention are some of the best ways to reduce the chances of a bad trip. Bad trips aren't inherently bad though. I view them as sort of a puzzle that you need to piece together to find out why the trip went that way. These substances are intelligent and even the bad trips can have some pretty profound meanings to them.
I think you would do great on a mushroom trip now that you are in your adult age. It helps you reflect back on your life and will teach you lessons. I dont think I would have the respect that I have for them now if I would have been doing these back in the day because back then, they were more of a party drug and not something for inner reflection.