There are two methods of replacing front wheel bearings.
A) The "I don't care if it lasts, I'm selling the car next week" method which involves pressing the hub/bearing assembly to the knuckle with hydraulic press. Be careful to not bend the brake caliper mounting points.
This is not fun to deal with, I had to replace a knuckle in my C70 because of this. Previous owner had wheel bearings replaced at some point and they bent the ears where the brake caliper bolts into. That caused the caliper to be misaligned and the caliper bracket rubbed against the rotor, they "solved" that by grinding the bracket. Yeah, I'm not kidding.
B) The "I want these bearings to last, I'm keeping this car for quite a while" by using either the genuine volvo tool kit or just a GEN2 78mm wheel bearing tool kit, like the Laser 5568 kit.
I used this method when I replaced the front bearings on my C70. It was not difficult at all. I replied to this thread here explaining the process, check it out:
run hub centric spacers Any particular model to recommend? These are spacers/adapters? FOUND OUT -> Or just rings that you fit around the 63mm hub to to fill the space from the 65mm? - - Plastic or metal? Thanks!
Hopefully you can do it the same way......