Hf 7x10 Spindle, Bearing, & Transmission Gear Replacement

I recently purchased a used 7x10. The previous owner faced off the chuck registration boss, so I have to replace the spindle. While I have it torn down, it has been suggested that I also replace the bearings and swap the plastic transmission gears with a set of metal gears.

I have done a good bit of research and have read the disassembly guide, but I still have some questions.

Is a hydraulic press absolutely necessary? I don't have one and really don't want to buy one. If I am going...

Hf 7x10 Spindle, Bearing, & Transmission Gear Replacement