[HOW-TO] Installing XBIAN directly on RASPBIAN IMG

[arie_papa]

I have a Raspberry Pi model B (512 mb) with a small SD boot card (128 mb) and the rest of the filesystem is placed on a USB stick (8 gb). I'm running Raspbian for a year now using it as a remote NX server.
I just upgraded to Raspbian Jessie which went fine.

I really want to use the Raspberry Pi besides the NX server also as a Xbian media center.

Is it likely that the installation steps will succeed with this setup (usb stick + Jessie)?
I've tried the installation steps half a year ago and it never succeeded and left me with a broken setup.

I surely will make a dd image of my usb stick, but I'm still a bit worried.