...on yourself: that's what it feels like doing an in-place migration of your computer from 32-bit debian to the 64-bit version. you transplant the libraries and the linkers, and hope that you match up enough 64-bit binaries with their libs and linker just in time so that the patient don't die from anaphylactic shock.
i really don't like reinstalling numerous boxes from scratch, losing all my configuration magic, so i decided to try making the changes in place, on the "live object".
it's a pretty tense exercise; there are numerous situations where
you're a single keystroke away from a totally hosed system. in the end
i didn't have to boot my rescue media, not even once (but having a
busybox saved me twice, as well as knowing
ar vx whatever.deb...)
debian is really cool but of course there's no automation for that
kind of operation so you have to hold
dpkg's hands quite a bit
to clean up your mess, but it's doable and even fun (once it's done :-)
and i've got four more boxes to mangle...)