When I was in your position, I asked a buddy of mine who had been a Armor in the US Army. I was told a 8th grader could build one, and he was pretty sure I could handle it.
First time the lower took me about 45 Min to build. I shot 1 detent pin across the room

My buddy said he could do one from parts in about 20 min. Building a lower requires a machinist soft blow hammer, needle nose pliers, a pair of visegrips, brass drift pin set, and some electrical tape to keep from scratching the surface.
Here is a Link
http://www.ar15.com/forums/topic.html?b=3&f=4&t=226782
Building a Upper requires a couple special tools and is a little more tricky (headspace and timing), so I elected to purchase one (ok 2)
I built a rock river lower, rock river 2 stage match 2lb trigger, standard small parts kit, Also put a better grip and shoulder stock on mine.
My uppers are White Oak Armory target, and a Colt H-bar for fun plinking
There are only 3-4 manufacturers of the upper and lower casting, which are sent to everyone under the sun for branding and reselling. Over all it is pretty easy and a lot of fun for a few hours
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