If you are certain that you want to have the bearings replaced, take it to a shop that does the work. To diy you would have to buy a bearing puller and bearing driver kit, bearings, shaft seal. You also would need an impeller wrench (if you are careful, experienced or both you can get away without this) so as to not damage the impeller when you remove it. The cost of these tools will outweigh the cost of having the bearings replaced.

You have to completely open the motor without damaging the wiring and without breaking the less than 1/8" through bolts that hold the thing together. Buy all the tools and parts and then break these and you'll need a new motor or shop anyway.

Just a few thoughts.