Is there an easy way of working out which way round to apply a chain whip to a cassette for its removal? I've taken plenty of them off in my time but always end up having a couple of tries at it before I put it on the right way round.
Not something I do often enough to worry about, but certainly a 'problem' I also have.... One solutiojn that comes to mind is write "Install" and "Remove" in the side of the handle you can see when installing and removing (My luck would be I would get it wrong way round).
The easiest thing may be to just think of it as applying the same exact force that you would be if you were riding the bike...
To quote Park Tool: "Hold cogs in clockwise direction with sprocket chain whip tool. Turn remover counter-clockwise, using a large adjustable wrench, the hex end of another Park Tool sprocket chain whip tool SR-1, or the Park Tool freewheel wrench FRW-1. It will require force to remove the lockring. Expect to hear a loud clicking sound as the locking teeth of the lockring separate."
Though I think actually doing the task enough times would instill it (kinda like how "righty tighty, lefty loosy" gets instilled in your mind eventually, without the little mnemonic).
I stick the lockring remover in and undo it, see which way the cassette turns, and then put the whip on to stop that rotation.
The other way (for me as a righty) is to use the primary (right hand) on the lockring tool and use the left hand on the chainwhip. You're always facing the cassette from the right side of the bike, so the chainwhip is up from behind.
Or treat it like a USB port... try and if it doesn't work, stop and flip it, try again, and repeat till it works.