Agree with all the above. Most important is attitude. Then a friendly domestic situation. Then knowledge. Then patience, and
a well lit and climatologically comfortable work space that is accommodative to comfortable work positions.
Then we get in to tools that let you use other tools;
A solid work bench. Solid way of holding your work in a non-marring way.
A way to measure and mark your work. Candle soot, inletting black, Dykem machinist blue, pencils (and erasers), calipers, squares, straight edges, awls, center punches, eyewear that lets you see close-tolerance details (like a 2 1/2x optivisor).
Others will chime in on tools needed to actually do the build, but that list gets specific to what tasks you are trying to perform. Trust me, it gets longer and longer, but the above is common to all.