(High-level view. I seem to keep getting lost in the details.)
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Determine what sounds are available in the new library, and what notes/keyswitches are associated with each one.
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For each sound (as much as possible), decide what combination(s) of instrument+technique are appropriate to activate each one.
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[Pro users] Define any new instruments and/or techniques required.
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Put all these combinations into a Percussion Map.
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For all affected instruments, review/edit the playing techniques to insure that all necessary ones are defined (i.e. all entries in the Percussion Map can be reached).
I’ve read a ton of information and watched some good/lengthy videos on the subject, and I think that this is consistent with them.