BT upgrades can be tedious at best, nightmarish otherwise. I have not had any upgrades go particularly well until some time after launch. Let others set the bugs worked out. I typically run BT in a VM of some sort, so I typically set up a second drive for data and can then attach it to whichever other distro I need. I always keep the old versions around, but it seems best to do a clean install in my experience.
A+, Network+, Server+, CISSP, GSEC, GCIH, GPEN, GCIA, GISP, GCFW