My question is this: My 450 is the first bike I've owned. I consider myself pretty mechanically sound but have never really worked on bikes. I'm the only one out of my group that is on a thumper, so I don't really have anyone to look to for advice. I don't want to get into the valve project and screw something up or sit there scratching my head, wondering what to do next . Are they something a first-timer could handle somewhat easily or should my first valve check-up be left to a professional, and if so, what could I expect to pay for the service? Any ideas, opinions, or confidence-boosters would be much appreciated Thanks!