This info couldn't fit onto my headstock repair DVD but I feel it's important for the home user to know. Headstock repair requires certain tools many hobbyists may not own. However, you may have access to these through a friend, work or local machine or motor shop.

Essentials:
Shop press (I use 3: 12 ton rectangular frame floor model, 1 ton benchtop model, 12 ton A frame floor model)
Bearing separator (I have 3 different sized ones)
Snap ring pliers, internal style and external style (I have several, with different pin sizes)
Electric multi-meter or ohmmeter for testing ground, electric cord, motor and switch
Drift pin/roll pin punch set
Dental picks
Wire tools : stripper, crimper, wire cutter or all-in-one tool
Shop vacuum
Air compressor
Essential for disassembly, cleaning and reassembly: 3 in 1 oil or similar, mineral spirits or similar, Johnson's paste wax, penetrating oil, powdered graphite, loctite, lithium grease, shop towels, synthetic steel wool, detail brushes (toothbrush, steel brush, brass brush), can or baggies for small parts, electric tape, shrink tubing, contact cleaner, 2 part epoxy, super glue

Nice to have items:
Gear puller set, Tap and die set, Heat gun, blind bearing puller, dial caliper,
Soldering gun or soldering pencil
Socket headed screwdriver set
Open and box wrench set
Parts washer, portable steam cleaner

Everyday items you probably have:
Various screwdrivers (phillips, slotted, big, small and medium)
Vice grip pliers (all sizes)
Adjustable wrenches (Crescent type, all sizes)
Slip joint pliers (big and medium sized)
Needle nose pliers (big and small) and tweezers
Allen wrenches
Mallet & Ball peen hammer
Bench vice
Dremel multi-tool
Drill/driver and various metal drills
12" clamps
Magnifier (to read bearing part #'s or see tiny details)
Fine metal file