sweater progress!

I've been making some progress on my Lopi sweater.  I'm almost done with both sleeves and then it's time to join the arms and body together and start the colorwork.  I have to admit though, I'm really nervous for that part!  I've never done any colorwork before and the thought of it is making me a bit queasy.  Are any of you colorwork champions and have any tips for me?  Probably tip number one is to relax, ha!