Replacing the dust seals and changing the oil on a mountain bike suspension fork is not rocket science. The manufacturers recommend servicing the suspension fork every 50 hours of riding at the latest. We say: For the average rider, it is sufficient to replace the seals and change the oil once a year. Only frequent riders and bikers who are often out and about in muddy and wet conditions should consider a small service twice a year.
With the service kit from Rock Shox (15 euros), a basic wrench kit and the service videos, any hobby wrench should be able to do it themselves.
As a PDF download you will find the entire article on the small suspension fork service on a Rock Shox Reba below.