Installing the new valves by yourself is quite easy--deciding on [configuring] the valving rates is the difficult part. You first have to analyze what is "wrong" with your current valving, then decide what kind of valving will correct it. Race-Tech sends a very comprehensive video with each Gold Valve kit showing you HOW to disassemble fork or shock and How to install the new valving but it's up to you to come up with the correct [?] valving. They supply tables where you enter your weight, riding ability, etc and you get a valving suggestion, but I've had to re-revalve several times to get the results that I wanted. The KDX shock has a standard compression/rebound piston that is easily revalved without the GV kit. The forks, however have an "on-off" type valve that is near impossible to do anything with. Get the GV kit and install it up front --You'll be glad you did. This leaves the fork with a bogus rebound valve [that same on-off thing] though --and the stock KDX rebound is way too quick. MX-Tech and 1 other co. offer adjustable rebound valves but there's another $125 "down the tubes" so to speak.