Motor and Spool Are Separate From Frame
You should only need the regulator, not the motor. No special tools needed other than possibly a TORX wrench to separate the motor and frame and a really heavy-duty pop riveter for puting the assembly back into the door. At least that's what I found.
I guess a '99 could be different. Recommend you talk to Phil at PartsShop to confirm. He can send new rivets too.