Replacing rod bushings is not a difficult job but you must have some special tools if you're going to do it with the crank assembly still in the cases.
Harley makes a special tool with which you remove and reinstall the bushings with. Basically, it's a couple of metal cups and a bolt. You ues the cups in one way and pulls the old bushing out. Use them the other way and pulls the new bushing back into the rod.
Once you have the new bushings in place, you must have a special **** with which to **** the new bushing to the correct inside diameter.
If you have the crank out of the cases and the crank is disassembled, you can have the rod bushings replaced the way most other such bushing are replaced in a machine shop. They have equpment to press the old bushings out and new ones back in and then hone the bushing to size. Simply take them your rods, the new bushings, and a new piston pin for sizing the bushing too.
I do not have the part numbers for the tools needed to do this job as I don't have a service manual in front of me. If you need the numbers of those tools, contact me directly at firstname.lastname@example.org