FTM 2012 : Delete a tree and Download again

The Companion Guide to FTM 2012 says that I can delete a tree in FTM that is currently linked to Ancestry. And as part of that deletion:

"3. If the tree you're deleting is linked to an online tree, you'll be prompted to delete that tree also. Click YES to delete the tree; click NO to keep the tree."

Sounds pretty scarey to me - any slip here and your "original" tree at Ancestry is deleted. A bit of a worry. Anyone done it this way ?

When I looked at "Sync Options" there is one there to "Unlink Trees" - but you then get the just as scarey a message:

"Choosing to unlink these trees will sever the link between them.

Once unlinked, changes in either tree cannot be synchronized to the other and the trees can not be linked together again."

I dont think that means I cant ever link my online tree again to FTM if I start again by downloading again and starting sync again - BUT - thats just an assumption on my part. I would prefer not to take a risk with a wrong assumption.

Anyone deleted their FTM 2012 tree and started fresh with a new download from Ancestry ? Which way did you do it ?

Cheers : Lindsay