Migration is rather easy. There is an official importer available, as well as a great one by Jake Bunce, for vBulletin 4. Many members here are vBulletin converts, including me. If you have any trouble with importing, these forums offer great support, and many people offer conversion services for reasonable prices.
It looks like I can convert my blogs yes?
If so, I'm guessing I install every add-in that I want vb4 converted prior to the migration correct? In other words, if its true, that I can convert my blogs, I would add the blog node to my xenforo first, then perform the vb4 to xenforo migration?
I should note that I use openx an independent ad system so I just need a place to drop code into these areas. Is this easy. I'm by no means good with code nor do I want it to become complicated for me.