Agree with pre- and post-HAATT checks.
But 'PAT' applies when changing power settings;
'SHT' (Select attitude, Hold, Trim) applies when changing attitude (i.e entering climb or levelling off) with a constant power setting;
'PAAT' (Progressively Adjust Attiude and Trim) applies when accelerating/decelerating in level flight;
'LAI' (L
k out, Attitude, Instruments) applies when maintaining anything.
So, from S&L at one level to S&L at another, it would go:
PAT - SHT - LAI - SHT - PAAT - PAT - LAI.............
With L
kout in between everything else!