I may have mentioned this before, but it's worth mentioning again. If you've removed a bearing from a shaft or housing, and need to drive the new bearing into place, grab the old bearing, modify it and use it as a bearing race driver.
If you need to drive the outer race of the new bearing into a housing, disassemble the old bearing and use a cut-off wheel in a die grinder or a chop saw to cut a slot complete through one side of that outer race. If you place that sliced outer bearing race against the outer race of the new bearing, you can pound on the old race to drive the new one into position. The new bearing ends up a press fit, while the slot in the old race allows it to "collapse" enough so it can easily be removed.
If you need to drive a bearing onto a shaft, you can slice a slot in the old inner race and use it to drive the new bearing into place without concern that the old inner race will get stuck on the shaft. Just be sure to use a file to round off the inner edges of the cut you make to the old bearing race to prevent those edges from scoring the shaft.
Some mechanics have carefully accumulated a drawer full of split bearing races they use to install bearings of various sizes. It's not an elegant way to install bearings, but it works, and sometimes that's all that matters.