There is a fairly simple solution to getting bearings easily into or out of wheels, which works so well.
A little lube on the outside edge and surface of the bearings or even round the rim of the wheel (getting them out too) goes a long way to helping ease them in or out with minimum effort.
Bearings that have been in wheels for a long time are often the hardest to get out, but it still works well enough, one drip into the edge and use a screwdriver to wiggle the bearing a little back and forth and it almost always comes out very easily after that.