Psychedelic-Assisted Therapy

I've tried everything for my depression - talk therapy, STG, meds. Nothing seems to work. Psychedelics seem to be the final option but I'm scared.  It seems like a huge dark unknwn hole, I just don't know what's been studied, what type of psychedelics should I be exploring? What's legal, what does the process entail? If you have articles or can send me in some direction so I can figure out if this is something I should be trying... I'm just so confused and really feeling hopeless.