The Daily Affirmation
It took all day but:
1. I got Facebook Messenger installed, working and (apparently) sustainable/repeatable on my cheap Polaroid Android tablet
2. I rooted my Android phone successfully, then installed, set-up and began using Link2SD to expand the "usable" memory of the device, move apps off the (limited) internal storage and (apparently) make the phone more viable in the long(er) term. [Which potentially saved $400]