Switch is easy. 2 screws and it is off. Take the battery cable off of course. It can be done while in the truck, but 2 bolts and it is on the bench. There are 2 switches, one with a screw post and one without. If you have the post it goes to the + side of coil. If you don't you don't.

This is without.

http://www.classicparts.com/1941-54-Starter-Switch-w_o-Side-Term/productinfo/53-711/#.VA9QefldVmM

And with.

http://www.classicparts.com/1947-59-Starter-Switch-w_Side-Terminal/productinfo/53-712/#.VA9QofldVmM

Steve H