I know most people dont have a lot of access to an oxy set but the easiest way to remove bearing cones is to use a cutting tip and slice the bearing cage at the top and bottom on each side so the rollers and cage comes off. Then change to a heating tip or large cutting tip. Stand the shaft so the bearing shoulder is up. Rotate the shaft and heat the inner race evenly. When it gets hot the race will simply drop off. If the race has already spun on the shaft it may be siezed and this may not work. If you heat the race too slowly the shaft expands at the same rate and the race doesn't fall off.
To replace the bearing try preheating your oven to 100 odd deg, leave your bearing in there for 20 minutes and then it should drop straight on. Dont go past 130 deg or you may weaken the bearing and it turns a nice blue colour.

. Dont take too long to drop it on because they are only small bearings and they cool down quickly.
To put the cups back in the hubs a little easier put them in the freezer for a couple of hours and the hubs in the sun. Probably still have to give them a tap but not as much.
PS haven't done this on a mini before but the principle is the same.