I did the Chrome slider conversion from HD this past winter and wasn't bad at all but I did remove the complete forks from bike as I wanted to put new bushings and seals etc in at the same time. Mine is a 2000 with air ride. Trick that I learned was to get a long clamp (pistol style where you squeeze handle and it tightens) with fork mounted gently in vice or some other clamp mechanism so both your hands are free, you slide spring in and slip threaded in cap in place a top of fork. start snugging up clamp so its pressing the threaded top cap into the fork assy. Once you have it just touching start to gently turn cap so it grabs threads and starts to thread in. Once you have that you are good to go. They sure like nice with full chrome frontend. Hope that helps.
- BUM