I'm thinking about doing this myself on a 2015 Streetglide special. I have reasonable mechanical skills but no air impact tools. How tough a job is it? Do I need special tools? Thanks for your input.

 

Subscribed to this thread. I'm also thinking about this modification.

 

If you don’t have a Service Manual and Parts Catalog youshould get them, and if you like working on your bike get the Electrical Diagnostic Manual too. Best money you will spend on your bike.
Follow the procedure in the manual it is easy to read. I often use the breakdown drawings in the parts catalog to get a better understanding of how things go together.
I’ve rebuilt 3 sets of forks on 2012 FLHTK’s and it’s not a hard job. No experience with the new forks but I do have the 2015 manualJ.
One thing I learned was to use an impact wrench to loosen the screw in the bottom of the slider that holds the damper tube. #18 in the drawing. I use a Dewalt ½ drive cordless impact wrench. It takes a long Allen head socket to get in the right fork, 6mm.
I bought a Motion pro oil level tool to get the correct level in the fork. Use Type E oil 3.74”
Loosen the fork tube plugs while the fork is still being held tight by the pinch screws in the triple tree. You may have to loosen the pinch screws and let the fork slide down a little to get at it.
I used an Irwin quick grip clamp, held firm in my vice to compress the fork spring so I could start the Fork Tube Plug in the Fork Tube.
Torque wrench
I did buy a fork holding tool and never could get it to holdone firm enough to work on it.
Good Luck

 

Pulling the legs off are a snap - so is pulling them apart - getting the correct amount of fork oil back in is probably the tricky part - Do yourself a favor if you're going that route, get a Progressive monotube cartridge kit and replace the stock springs - I just ordered a set and plan to go this route.....