The axle with the gear is easily driven out with a pin punch. I recommend using a brass one if available. This eliminates the chance of damaging the end of the axle.
As it's driven through, the splines for the gear may score the inside to the bearing it goes through. I do not know of a way to avoid that.
When I install a new bearing, I like to put the shank (uncut part) of a tight fitting drill bit in the hole to prevent it from becoming smaller as it is pressed in place.
Once again, when the axle is put through, the splines for the gear may cause a little scoring inside the bearing. If anyone knows a way to avoid this, I would like to read about it.
The problem with pressing one wheels without proper cups is the fact that most wheels, including your nickle rimmed berk ones, are not flat. If you don't care to buy cups, you will have to rig something up.
Before Lionel sold presses and cups, they advised repair folks to make their own cups, and use a metal lathe to press on the wheels. This was done by putting the cups in the head stock and tail stock, and advancing the tail stock closed.
Not owning a lathe, I've never tried it.
Once I had a press, I started buying cups as I needed them.
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