http://www.tacproshootingcenter.com/PDF/3gunFormMay08.pdf Should be a good time, I just did my first 3 gun at Tiger Valley, and they did such a good job with it I'm hooked. Can't wait for this one...
I am very interested in 3 Gun Shooting but haven't ever been to a match. I may attend this one just to get a feel for it. I have all the gear (I think) and I am an avid shooter (especially AR).
Tac-Pro used to offer a 3 gun tactical techniques class the weekend before the matches, you may want to contact them and see if they still offer those. I attended one and it was very informative as far as the equipment and preperation for the matches.