I'm currently building an Ar15 on an Aero lower...don't have a ton of experience doing so, but there are plenty of resources on the web. I put mine together the other night, minus the trigger I don't have yet. Went together no problem at all. You should do fine.
I got my Aero lower from New Frontier armory. Got two friends to go in with me. The price is a little cheaper if you order the 3 pack. Get a couple friends to go in on it with you and save a few bucks.