They are no harder than any of the others. Just remove the C-clip, push the axle that the arm pivots on inward and remove the arm. Once you determin which thickness of shim you need, put a little grease on the shim to hold it in place in the rocker arm and then re-install the arm on the axle. Re-install the C-clip and you're done. Takes me less than a per arm for the actual removal and replacement.
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