just to let you know, since this happens pretty often at the shop i work at, if you plan on taking the bike to professionals after you're done building it up and asking them to check your work - they will likely charge you for the time it would've taken for them to do it.

i don't know what your mechanical aptitude is so i can't say whether or not you ought to have someone else do it for you but there are bike coops in many cities where you can get wrench time and free advice from people who know how to do the work. otherwise, consider just taking the parts to your LBS and have them put it together for you, maybe they'll even let you sit in on the process.