In the future don't use the peat moss pots, I know why you did, I did the same thing (or attempted to) on my very first grow, it seems logical so everything has room to expand, if your not comfortable using a razor and quartering the peatmoss so you can gently pull it off without damaging the roots, go ahead and plant it. It WILL STUNT YOUR GROWTH, but the roots will eventually get through, honestly, you'd be adding 2-3 weeks to your grow if you can't get it off.

Be gentle, use a very sharp razor, and try not to nick any roots, you should be just fine. - Most of all, don't be afraid to make a mistake, that's half the fun is figuring out how to do it better!