Actually I am confused. If you have the calipers off and the pistons pushed back, you just stick the calipers back on the brackets. Clean and grease up the slider plates that go in between the caliper and the bracket before you put it back together, and that is about all there is to it. There are no real tricks to it.
Like I said, I'm confused and trying to figure out what might make it hard. Did you take the caliper out of the bracket, or unbolt the bracket from the spindle and take them both together. That is the only way I can think of to complicate it. The easy way to do it is to pull the caliper out of the bracket, leaving it (the bracket) bolted to the truck. You pull the little snap pins out of the slider plates, pull both of them out(top/bottom), and you can just tip the caliper out of the bracket. If you had it all stuck together it would be harder to put back on over the rotor.
With the bracket on the truck, you drop the pads into the bracket, tip the caliper back into place over them and the rotor, and stick the sliders back in to hold the caliper. It should be fairly easy.
I hope somewhere in this mess of a post you can find what is holding you up.
