Your advice is well taken, Pappy - thanks for the feedback. I think you & I are on the same page regarding the bearings.

Now I just need to find a 3-arm bearing puller and a strap wrench (to hold the impeller).

One more thing: I have read that it's recommended that when one replaces the bearings, it's also a good idea to replace the "shaft seal". I'm planning on doing that.