Fronts are very easy. Loosen the big 32mm nut before jacking the car up. pull the caliper rotor and associated cables etc. Remove the top drop link mount so that the hub can slide down the shock. Pull it down and you should have enough wiggle room to remove the stub axle/speed sensor wheel thing. Once that is out you can use the SIR tool to pull the old bearing and press in a new one. Pop the little wheel thing back in, Push the hub back up the shock and put everything back.
Rears are a little trickier. start as per the fronts loosening the 32mm nut, removing the caliper and rotor etc. Then the best way I found without disturbing the alignment is to use a ball joint splitter to pop the control arm and A arm joints off the hub, remove the drop link top mount and slide the hub down the shock. This should give you enough wiggle room to pull the drive shaft out of the hub.
Don't try and use a pickle fork to separate the ball joints, it will wreck the rubber. use a tool like the one below. very easy and quick.
