I kept getting behind the curve on the ME/IR until I changed instructor who taught me one of his his own mnemonics. Of course there are no end of mnemonics for the IR, but I found this one very useful.It is especially useful before top of descent and again as an approach check in case you forgot anything.
ABCDEF!
A=ATIS/weather
B=Briefing (what am I doing, what do I do next, then next?)
This also includes official briefings eg approach briefing to self & instructor before top of descent
C=Comms & Nav set+approach procedure
D=Descent profile
E=Zone entry
F=Fuel plog/sufficient for holding+diversion etc
G=Go-around procedure
H=Hold procedure (if relevant)
Good luck!