This thing wasn't difficult at all to install and if I could manage to do that, after qole explanations in the wiki, it will be a breeze for 90% of people on this forum. After installing the debian root, apt-get updating and upgrading, and installing OOO, it is some 1.2 gigs large on my second partition on my n810 extarnal mmc.
And, OOO is absolutely usable. Of course is slower than on a modern machine, but who cares...! I can do *all* of my things, now, wherever.
Heartily thanks, Qole. And - this debian thing has definitely a lot of potential :-)