You'll need a special tool to do it as well as a feeler gauge, shims (if any need to be swapped out for the correct clearance), and gaskets. I just take mine to the dealership and pay the $150ish to have them do it. The last two times I've had them checked, nothing was out of adjustment so you never know. It'd be worth buying the tool, but the cost of the gaskets + time makes it worth it for me to just drop off the bike.