Best way is to use a long peice of rod and hit on the inner beaing race. Use a large hammer and give it a good hit. Smashing them apart it an option but very risky. It is easy to damage teh hub doing that. You could try heating teh hub up, or find someone with a press.
cheapest way is to find a bolt/screw that just fits inside the bearing
get a 1mm thick cutting disc for your angle grinder and fit it, put your safety goggles on.
hold the bolt firmly in a vise, and cut a slot in the head, and down the thread a little 25mm is usually enough.
drop the bolt into one of the bearings and have the thread come out the other side a bit.
now find a large flat headed screwdriver and slip it through the bearing and into the slot you cut.
gently tap it into the bolt, as it moves into the slot it will expand the bolt head and grip the inside of the bearing
tap the end of the screwdriver a few times and the bearing will fall out