How to Install New Pistons on Old Connecting Rods?

Then you have floating pins in bronze bushed rods. Just pull the retaining clips and use your thumb to push the pin out. Reverse to install the pin.
I believe you need to take note of which way the piston is facing on each rod, so they can be reassembled correctly. This will ensure pin offset is correct, & valve reliefs, if any, will be oriented correctly. Also the rod big end "spit hole" should face the cam.