A thread of Jeffs.
I have a shim kit and a Flyingfool built tool (although, flyinfool's tool is worth buying). You are welcome to use it. Been a couple of years since I have done the shim check, but can likely figure it all out again if you would like help. Additional tools needed - 19mm socket, set of mechanics picks, micrometer, and ideally, metric feeler gauges.
Have a clean bench around as you can use this opportunity to set the fuel bowl float levels. If you want to tackle this also, it would be beneficial to get the float bowl gaskets when you purchase the valve cover gaskets. Procedure is in the 2nd Generation Tech forum.
FYI - At 30k miles, you will more than likely not have to change any shims. Although, it is a good thing to check.
RR