This video shows one method of removing and installing a starter on a 1996 S10 4WD Blazer with a 4.3L V6. This video also includes a few tips to make the job a little easier.
It is a known issue when pulling a starter on this vehicle that the wires are very hard to get to as well as getting the starter out can also be a little hard.
Changing this starter out should take roughly no more than an hour, that is laying on a creeper. If you have a lift, I would cut the time in half.