how do i replace front wheel bearing on my corsa-t reg?

I would not recommend this for DIY as you really need a hydraulic press to remove install the bearing. It is possible to use a brench vice and a big socket for this but you risk damaging the bearing. I recommend the most you do is disasemble the hub and take it to a sympathetic mechanic.
Removing the hub will require much prying, hammering and sweat. Remove wheel, remove hub nut, remove brake caliper (dont let it hang on the pipe!), remove brake disc, remove lower ball joint (dont damage the rubber on this), remove bolts from base of shock absorber and release it, withdraw the hub from the drive shaft. These bolts will all be quite rusty, dirty and very tight (covered in treadlock).
I cant remember every detail or in right order, but thats why you should get a workshop manual.

Jmmy
August 2008