I actually had to replace the steering column bearings on my Xciting 250 early last year.
I was able to remove the upper outer race no problems (you can use a race puller), the lower one (as said here) I ended up using a dremel diamond engraving bit to slot all the way through it (took almost two hours, since going at it agressively destroys them), then putting a pair of short slots to either side of the cut so that I could use needle nose pliers to compress it and extract it.
The innter lower race bearing, I had to slot to remove. Installing the lower inner was a matter of tossing the fork in the freezer and the race in the over, then hammering the race down using a 1" x 12" NPT pipe.