The heritage springer fender is way different then any other fender unless it is a springer classic which is the same fender.
The wheel does come off and has to. You will need to raise the bike off the ground.
I have a PDF for the heritage springer front end kit that shows the removal and install. Here is the link below. There is a lot more work to do then for a typical fender. You do not need to remove the press fit bushings in the fender if you are using the same fender and putting it back on.
The wire for the light is removed by lifting the fuel tank up and back a bit and then removing the wire from the connector under the tank. I recommend that you do not cut the wire because it can get corroded and cause problems later.
So you are going to drill holes in your fender to attach the stanchion?