Tools I deem essential - besides the mentioned allen wrenches, screw drivers and metric combo wrenches that aren't bike specific.
Chasing & facing I take in.
Press in most headset cups and crown races myself with all thread and pvc or copper pipe.

Cone wrenches 13 - 17mm probably need 2 of some sizes.
BB tool for your chosen BB & crank
cassette tool for your chosen cassette, chain whip
Headset wrench if its a threaded stem.
Good quality cable cutters - I have Felco
metric dial calipers and steel ruler
digital camera to document things and post "what did I do wrong threads"

Supplies - loctite 248
Marine grease
anti seize
car wax - wax the frame before assembly