"Simply the advice to plan your trip and make sure you are in a positive, relaxing environment with a trusted friend to babysit you. Don’t expose yourself to anything overstimulating like television or unfamiliar music. I recommend food, your favorite music, and maybe some supervised cute animal videos to start with. After you have tripped once and come down, you can decide whether or not you can handle a second trip with more stimulation.
Watching “trippy” films, listening to Pink Floyd or going to club might be the actions popular culture associates with hallucinogen use, but these are NOT experiences you want to have on your first trip! You need to get used to managing yourself in an altered state before you try anything that might scare altered-you.