if you are talking about the cylinder the key goes in to, then you need:
steering wheel puller (any GM one will work)
lock wheel compresser (AUTOXONE should give u these together for rent)
6-8" philips head screwdriver.
the ignition cylinder itself is held in by one screw on the right inside the steering column. just remove it, slide the key cylinder out and the new one in. line up the groves and you are good to go. ith ignition cylinder itself is like $10
1994 Jeep Cherokee 4x4 5 speed 4.0 H.O. flex headers, Flowmaster cat back, Magnaflow cat, stock clutch, K&N, 6.5" Rusty's lift w/ RC long arm, 35" mudders, Bushwackers, JCR Stage 3 Sliders, ORO U-turn Steering, Dana 44, Detroit locker, Dana 30 HP Detroit Tru trac, 4.56 gears, WJ 32mm Front Sway Bar, 136amp alt, Custom High Dollar Paint Job!
2014 Jeep Grand Cherokee Overland V8 4x4 5.7 HEMI, 8 Speed Auto, Quadra Drive II, Quadra Lift Air Suspension, Tow Rig...for now.