I can't say anything about the 80% AR reciever. But you only need punches, screw drivers and a hammer to assemble the lower on an AR. The upper needs a few tools designed for the AR, most AR parts kits have the upper already assembled.
If you get a 100% reciever for the AK you can do a screw build with basic hand tools & a hand drill, it can be switched to rivets later when you get the tools.
For about $20 you can get a pulley puller to pull the barrel, and if you don't have or have access to a press you can use the all-thread to reinstall it.
But for $30-40 you can get one of those Harbor Freight bench top drill press, it would be a lot easier then a hand drill.