No need to drop the sump off.
if there’s a single screw into the rear of the motor between the 2 black rubber studs, remove it.
Dishwasher onto its back, then remove the base plate.
Disconnect the motor and element wiring and tidy out the way.
Disconnect the pressure switch wiring, and tidy out the way.
Put a towel under the spray tube hoses, remove the hose clamp and disconnect the hose.
Remove the spray arm tube clamps, and ease the tubes off carefully.
Put a screwdriver up behind the motor to ease the back panel away and ease the motor down and out.
Once you have cleared the impeller and housing, refit in reverse but use WD40 or similar to help the spray tubes slide on and the motor entrance slide into its seal.
A little lube on the rear mount rubber also helps.
Refit the rest, standup and test.
Obviously you should have unplugged it before doing anything.
The towel is to try and protect the relay and any other electrical from any water that might flow out when pipes are taken off.
Thats how I do it.