There is a lot of shit to be cautious about..

Have plenty of water, because you get dehydrated..
You'll get warm, not like overly hot, but you'll definitly feel warm..
Lights become very vivid and you like to touch a lot..

If you are a new comer..

Take 1 pill at most, wait an hour, a it should kick in pretty well....if you feel you can handle another dosage of that, take another, and so on and so on..

But they definilty fuck you up for a while.

Oh, and be careful about the shit you buy. Anyone can make a pill look like an X pill. They all have markings in them and you can do your research online on to which ones are the best.

Goodluck, have fun, and just be careful..