Changing the handle bars on a harley

If it's a simple swap out, meaning you aren't changing switch housings and stuff, it's not difficult to do. What is probably going to give you a problem is wire and cable lengths. Naturally, if your bars are taller or wider, you'll need longer wires and cables. If the bars are shorter or narrower, shorter wires or cables. If the wires are too long, this usually doesn't pose a problem, simply wad the excess wire up and hide it somewhere. If the cables are too long, you'll need to figure out the lengths that you need and probably order them aftermarket. Good Luck.