allways great to see someone having a go, and learning on the job, (makes me sound like an expert but I am an amateur) getting stuff done without the right tools is best left to those with lots of experience, most things can be done more than one way, the bearing splitter will work, but as always care, patience and maybe a little heat, boiling water is good, so is the paint stripper heat gun and even a propane lamp, if used with extreme caution, heat can ruin the temper/hardness of gearbox parts quite easilly, use the splitter first, if it doesnt budge with a little force, get it warm. some very thin oil, eg penetrating fluid, is also a good idea to help the slide, sort of doesnt work with the heat bit though. You will feel what is good or not.
CLEM