top working my Valencia Pride - it's a monster!

[happyisland]

In a previous discussion on Valencia Pride trees someone suggested top-working as a solution to the VP's runaway growth. I have been trying to figure out if this is what I should do, and I have some questions for you grafting badasses out there:

1) is this a good idea?

2) will top-working a slow growth variety I have like NDM onto the VP base calm the tree down completely?

3) Can this be done in phases? IE, can I do a quarter of the tree at a time so it's not too ugly? The VP is a beautiful tree and it sits in my driveway in front of my house, and I'd rather not have it reduced to a stump for aesthetic reasons, if possible.

4) does someone like me, with zero grafting experience, even stand a chance of making this work?

Thanks! I am fighting a losing battle trying to keep this tree subdued, and can use all the help I can get.