Yea make sure to use plenty of assembly lube, take your time when you're re-tightening the rockers. Before I fire it up the first time, I like to crank it over with a wrench and breaker bar several times while listening to make sure there's no PTV contact or anything.. but that's just for my peace of mind.
Triple check the top of the head before you put the valve covers back on to make sure you don't leave a socket or other small tool in there.
And depending on what size cam it is, you may want to replace the valve springs.
amen to the valve spring recomendation. get a set of springs that matches the cam. Lots of hp can be lost in the top end with out the correct valve springs.