Hope this isn't off topic or too obscene or anything...
Here there are many questions about sex but not so many about foreplay which is what my question concerns so..delete or whatever if i'm too off the wall or something here!

I've known this guy for about a month now, and we had been dating for about half that time but were only officially "together" for a few days. Anyways I like him a LOT, more than I think I've ever liked any guy before. And I trust him, he has never and will never pressure me into anything. Unfortunately i seem to pressure myself.

The other day we were laying in the back of his car (just laying..) and we started kissing and such. One thing led to another and his hand was down my pants. Afterward I knew that he wanted me to do the same for him, but I've never done that before and would hate to embarrass myself or anything terrible like that! so uhhhh any advice on how to handle the situation would be MUCH appreciated!