I've been doing trigger jobs on 1911s for many years. For me, they're very easy but for the novice, they can get you in trouble. 1911s have loose tolerances except for a few places, the thumb safety, sear, and hammer notch. Honing the sear improperly can cause the gun to go full auto ... not a good thing.
What you want when finished is a pull of 3.5 to 4 lbs with no creep. The disconnecter, thumb, and grip safety must work properly. The hammer should not fall when the slide slams forward.
Honing the sear is part of creep reduction. The rest of the work involves buffing all friction points, adjusting spring tension with the mainspring and the 3-finger spring.
For a beginner, I'd recommend a "drop-in trigger job". This is a kit made by Nowlin and sold by Brownell's. The kit includes a sear, hammer, disconnecter, mainspring, and 3-finger spring. The sear and hammer are honed. Cylinder & Slide offer a similar set except they cost more. Prices range from $80 to $180 depending on the kit. It's still cheaper than paying a gunsmith and is something a beginner can do. See:
http://www.brownells.com/aspx/NS/store/ProductDetail.aspx?p=9578&title=1911+AUTO+DROP-IN+TRIGGER+JOB&s=23820#23820If you're not interested in a drop-in kit, I'd recommend you buy a book or video tape that shows step-by-step procedures. Sorry, too much to post here.
