major tools for a full bend and build are a bending jig, a press, experience with riviting, some form of torch for heat treating. grinder to de rivit the old parts kits
witha 80% reciever you will need a drill press and all the stuff above except jig. press isnt nessasary but helps
for a 100% reciever build you will need basic shop tools. press not nessasry but definatly helps. if you dont have rivit experience i wouldnt try to learn ont he AK. either practice before, or do a screw build.