How do you replace the drivers side door handle on a 1996 GMC Sierra?

Assuming you are referring to the outer door handle, remove the inner door panel and look at the back of the handle. You will see a couple of steel rods attached to the handle, remove these(they just unclip)and move them out of your way. You should be able to see a couple of small nuts holding the handle to the door. Remove these and the handle can be pulled out of the door from the outside.