You won’t need all the tools of an A&P mechanic to build your experimental kit aircraft but those you use should be in good condition and of excellent quality.
small drill bits, numbered & fractional
extra #10, 20, 30, 40 drill bits
6″ & 12″ long bits, #30, #40, 3/16″, 1/4″
sabre saw with metal cutting blades
carpenter’s levels – 24″ & 48″
razor trim knife
tape measures – 12′ & 25′
straight edge rulers – 1′, 3′, 6′
Clamps: vise grips, spring clamps, C-clamps
sanding blocks – hand block, long board
pop rivet puller
trouble light, fluorescent
hand tools: wrenches, screwdrivers, pliers, hammers, etc.
handshears (tin snips): offset handle style, one each-left cut (red), right cut (green) and straight cut (yellow)
Special tools that are a worthwhile investments and a great help:
Dremel Tool kit
die grinder – with drum sanding kits, cut off wheels and grinding stones
bench drill press
fiberglass cloth cutting table
roller blade (rotary cutter) for cutting fiberglass cloth & fabric
2″ wide paint roller or wallpaper seam roller
manual rivet squeezer (saves time when installing nutplates and less violent than air driven rivet gun)
cleco pliers and clecos: 100 of #300 clecoes, 10 of #40 clecos, 10 of 3/16″ clecos, 6 special side clamp clecos.
THIS LIST IS NOT ALL INCLUSIVE BUT GIVES YOU A REALLY GOOD STARTING POINT.