LXDE to KDE all while using BTRFS

[dlalias2k1]

So, I'm wondering which would be cleaner/quicker.

Using the commandline to switch over to KDE from LXDE.
I assume it'd go something like:
init 3
apt-get update
apt-get purge lxde*
apt-get install kde
apt-get install --reinstall distro-defaults
update-rc.d kdm remove
update-rc.d kdm start 24 5 . stop 01 0 1 2 3 4 6 .
apt-get autoremove

VS
backing up my NFS exports, sources.list, and praying my spanned btrfs drive survives the reinstall, then installing KDE from DVD.

I guess my real concern is the BTRFS drive I have, It's large and important to me, So i'd give it the best chance of remaining intact.

[piper]

IMHO, I wouldn't use autoremove
, especially in sid

[michaa7]

There is no *need* to purge lxde when installing kde. Why not leaving it untouched as a fall-back?