My first time I was fifteen and he was also a virgin but we didn't have any trouble. It was like we've done it before. So trust me, it's not rocket science. Just put the condom on right, make sure there's a bit of foreplay to get her excited, maybe get condoms with the numbing lube if you're afraid you'll come too early, thrust nice and steady, (don't -blam!- her like a jackhammer) and make sure she climaxes. Anything else I didn't say is pretty much common sense.