Use a bong, be with someone, don't have any distractions (tv, radio, pc), feel completely comfortable...
good advice ^
don't be with anyone who you think will be watching you analytically or making fun of you. if you're not really close with a fellow tripper, just do it on your own.
when you smoke it, hold the light on it so it's white hot through the inhale, breath as deep as you can and hold it for as long as you can before exhaling - by the time the urge to exhale comes, you should start feeling tingling. for me, I don't actually remember exhaling the first time i did it (15x standardized)
it should smell a lot like tea leaves and the 20x may have some slight sparkling on them (salvinorum)
it's a strange experience. the trips are so short they're over before you've realized it's started. they're more intense than anything i've had with mushrooms, but i've never been too scared on them. the first one was really peaceful actually, even though it involve the ceiling of my bedroom falling away and existing in three different places at the same time.
i tend to feel a distinct tingling sensation on my skin, like something is pressing against it. i often feel a sensation that I or the room am rotating a little - always along the axis that goes from my eyes outward, straight in front of me.
the intensity scares a lot of people, but it's much easier to deal with than getting into some bad place on longer duration drugs
the only time i've gotten scared with it was when i thought i could feel a consciousness in the same room as me, right beside my bed. i'd felt them before, in large numbers, but this one seemed to be significantly more intelligent than the others and in control in some way. at the time, i was stressing over getting my laptop to sit on a chair beside me, which is going back to the beginning of this post - external issues
i always prefer tripping on my own. every group experience i've had has only detracted from it or made me scared in some way. music also sounds incredible while tripping