Some closure, if that's helpful to anyone else.
After returning home from my Sandwich Isles trip, I scheduled a 1-to-1 session at my local Apple Store on Saturday. I told my favorite genius of my apprehension in following the cited instructions (on the Apple Forum) without the opportunity to ask questions . . .
en route, so to speak.
In the end, it was a piece-o-cake (after all it's a Mac!).
After unregistering/deauthorizing my MB-Pro, on my iMac (where my complete calendar resides) I proceeded to
MobileMe––>Sync––>Advanced (checking the accuracy of all data shown)
––>Reset Sync Data (being careful that the flow is
from the iMac
to the Cloud) the job was done without a hitch.
I was also warned that I should select "
Automatically" for my future syncing schedule, rather than
Manually as I had previously, since with 2 Macs in harness "automatically" is the better option.
Hope this might be helpful to anyone experiencing the "inconsistencies".