I changed the fork seals on my XT660R last fall, and it can definitely be a bit tricky, especially if you don't have the right tools (I would also consider myself a bit of a newbie when it comes to working on bikes). You will almost definitely need either an impact driver or the special Yamaha tool (damper rod holder) to get the fork apart and back together again. I would recommend a fork seal driver as well, as that will help you out a lot when putting the seals into the fork. I had to resort to the "tape around the inner tube" trick when getting the bushings in, as my fork seal driver was not long enough to drive down the bushings, only the seals (worth checking if you consider buying one of those tools). I also had to create my own damper rod holder using a tapered wooden broom handle, when I accidentally screwed up while assembling one of the fork legs Eventually after a few nights out in the shed, I managed to get everything back together!