Upgrading Movable Type

I'm about to attempt an upgrade to Movable Type, the software that's currently running this blog. If you start to see weirdness on the site, that's probably the reason. It doesn't help that I can't find proper instructions for upgrading...

This video shows a 1.1 -> 3.2 upgrade as being seamless, so 3.1 -> 3.3 is presumably no more difficult.

Expect some template weirdness once I've upgraded.