Well Me(never did it before) and two friends (both had done it once) took about 8 hours, not bad since I saved like 400$ in labor. My advice is get a Helms manual(60$ or so) it has every little step and anything you'll need to know, its alot better than the books from Autozone and crap. Also while your in there replace your flywheel with a lightened one, check out
www.sohfast.com .