Fork seals on the at era of bike, and the maintenance in general is really simple and straight forward with little or no need for specialty tools. Best place to start is with the factory Kawasaki service manual. It has great pictures and descriptions of the procedures and parts call outs. Plus if special tools are required they will call them out as well. Over the years here at DRN we've hosted the largest most dedicated group of KDX riders on the planet. Check out the Canadian Dave KDX forum and you'll find a ton of useful threads and information on the KDX.