Yep Aaron, you will need a Dolly, I use a steel rod about 300mm long and 12mm diameter. Make sure it has a nice sharp edge. Poke the dolly down thru the spacer and push it to one side to expose the bearing. Give it a nice firm hit with the trusty 2lb ball pein hammer then move the spacer to the other side and do the same again.
You can make the job a bit easier by warming up the hub with a heat gun. When the bearing comes out remove the spacer flip the wheel over and do the same to remove that one.
Those Yamaha front bearings are piss weak in my opinion too small for the application. I remove the seals blow out the standard grease with compressed air repack with quality grease then put the seals back on. Get much better life from them.
Ollie