I just did my first one ever.. and it was really easy..
I used this page:
:: Guides
followed it pretty much exactly.. I swapped around the order on a couple things.
the only one that was even remotely tricky was the front roll pin.
I didn't bother with any of the special tools, my method was..
Use a very small pair of needlenose pliers to push the detent and spring down.. then slide the rollpin over the detent holding it in place, and just push it through.
I shot the spring out a couple times before I got it in there, but I think if I would have started w/the needlenose, It woulda gone smooth the first time.
I've put together two more lowers for buddies and all said and done.. it now takes me about 20 minutes from stripped lower to fully assembled (buttstock / pistol grip) lower.
Other guys are probably way more experienced than me but its really not that tricky.
I'd suggest laying all your parts out, and figureing out what's what before you start, and don't get the safety detent spring confused with the two rollpin springs. I did that on one of them.. lol