Online vs. live tournament poker

I just recently started playing poker "seriously" and have read harrington's books on NL holdem tourneys and i've found them helpful...i've fared relatively well online and won a couple of MTT's and made a few more FT's, but when it comes to live poker i just cant seem to think right or something...it's like all of my knowledge goes out the window and i'm a newbie again...has anyone ever had something like this happen to them?...and if so what might one do about it?...it could be just my nerves getting to me because i actually have to face the people...and will this get better with more experience?...thanks...in advance