You must dig little dipper in PBP librarys. Look for PBPPICxx.mac and PBPPICxx.LIB files for macro definition.
If I was in your place, I would start from controlling PIN, then LCD basic communication, to display char, then to math involved in digit extraction...
EDIT:
PBP libs are great resource for learning ASM.... Lot of work and testing are organized and described in one place....
I learned ASM from PBP lib, and PIC datasheet. Now all interrupts my are written in ASM.
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