Peter,
Before removing the bearings you will need to remove the spindle, in accordance with the Myford instructions for replacing the drive belt. This is a simple procedure – once you know how to do it. If you don't have a manual, PM me your email address and I'll send you a copy of the relevant page.
The bearings are an interference fit on the spindle, so will need some encouragement.
Once you have done this you should see your way clear to replace the bearings.
There was a thread not long ago on Super 7 headstock bearings, worth doing a search on the forum for "Super 7"
Phil