Amateur or professional? That you're asking suggests you may be able to do it yourself. Read the section in the manual and watch some videos then jump right in. The seals and fork oil are up for replacement at 30K or, surely, 18 years since factory installation.
Here's some additional information (copied from other posts I wrote when I did the job on my Roadster)...
***If you're contemplating doing the fork job yourself, with the right tools it is not that bad. I bought a spring compressor, a tool to set the seal, 2 feet of 3/4 steel square tube with a wall thickness of 1/16th (.0625) to hold the damper cartridge from spinning, and made a syringe thing to create the proper air gap. Follow the manual and it's pretty straight forward. You can do it. Note: some have luck using an impact gun to quickly loosen the bolt at the bottom before the cartridge spins, but to loosen easily and then tighten it to the
proper torque setting I used the square tube hack.
Beware when reinstalling the spring cap. The orientation of the spring cap in the manual is not shown consistently. On pages 14.10 and 14.15 it shows the spring cap turned so that the smaller part goes into the spring. That way the spacer fits in a shallow cup formed by the larger side of the spring cap. This is correct. But on page 14.13 it shows the spring cap flipped so that the wider cup part fits over the spring and the smaller part goes inside the spacer= wrong. See photo of pages from manual- picture at left is wrong, other two photos show the correct orientation for the spring cap.
Square tube to hold cartridge from spinning
Compression tool
Homemade air gap tool. To set the oil level..... I made the air gap tool with a very large washer, drilled a hole in it and ran the proper length of copper tubing through it, so that when the washer set on top of the fork the tube extended down right to where the oil level should be. Attached a flexible hose to the top of the tube, overfilled the oil level slightly, then suctioned off oil until it stopped- right at the proper gap. Motion Pro makes a similar tool too
Fork Seal Driver (43mm for the Roadster- check the manual for yours).
You'll need a long hex socket to reach the bolt on the bottom- I forget the size. I bought a set from HF and other sizes have come in handy for other projects.
I'd check the
AllBalls website to ensure fitament for your classic....
These forks aren't exactly the same, but this video gives you a very good idea of the process....