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You'll need to measure some things before you know what size shim you need. If it's the notched shim you really don't need a measurement but if it's the completely flat one you'll need to measure. A service manual will tell you how. Nissan sells shims. Decking the head you really don't need to measure shims. Usually you'll only need to change shim measurements if you shave the valves or cut the valve seats. I micrometer and dial indicator are the two things you'll need.
By guides I'm guessing you mean valve guides...and no you don't need new guides. Service manual is your best friend dude...download one.
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