Or you can do like me and change them in the water. And lose a lower unit into the drink because you were too cocky from doing it so many times before.
99% of the time: remove all bolts and tap, tap, bang, bang! Why won’t this thing come off?? Also because my previous outboards were all old.
Me last time: remove all bolts, grab the wood
piece and hammer to tap, before you touch it, watch it miraculously fall off with no coaxing and do a straight shot down the outboard
well and to the bottom.
I traded someone an air conditioner to fish
it out (by swimming) and it took hours.
Lesson? Don’t be cocky and put a safety
line on any damn thing that has the potential to get away from you. Ha ha.
Incidentally, that was like 4 years, 1000 nautical miles on the engines and the impellers and housings appeared completely fine. Original impellers.