i replaced one on my 96 and the only tool i needed was a puller to remove the harmonic balencer. you're suposed to get a CASE learn after replacing it but most never do or need to. (you should get a code if you do need to).
the only tips i can give you are
1. you will need more force than an air gun can provide to loosen the crank bolt. so use a breaker bar, leverage, and bump the starter over until its loose.
2. dont use too much thread lock on the torque to yield bolt
1996 with 254k miles, L32 4" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs. -RIP
AMG C400 White on black -daily