I very rarely use a press for bearings. The inner race can be removed by using a flat head screw driver or punch to drive it out from the opposite side.
To install to new race, start by tapping in the race with a hammer. Just a little at a time, little on the right, little on the left, little on the top, etc. Do it softly.
When you get the race flush with the housing, get a deep well socket that has the same outer diameter as the race and use it to seat it all the way into the housing.
Hope that makes sense. Let me know if you have questions.