Dvds' arrived today. The ar15 trigger job and the Complete Colt 1911, both videos by A.G.I.
I would highly suggest both Even if you don't do the job but to get a better understanding. This way you can see and say gunsmithing is not an art but a science. It shows the do's and don'ts and what tools are involved. The tools can be obtained at a local hardware store. Most if not all for $50, and some you'll already have.
On the AR15 trigger job, he took a 6.5lb down to to 3.1lb pull, then he took it back to 4.3lb pull by lenghthening the disconnector spring. If you sat down and did it the whole job, it should be right around 25 minutes.
The Colt 1911 video is a must have for any 1911. I've tore down mine and it did't act quite right after being reassembled. Rented the video , found I reassembled it wrong by one step on the safety.