And as for the original post's question, I think the whole idea of Easy Debian is supposed to be that you aren't really committing to much by installing it. Sure, you need a big enough SD card, but they aren't terribly expensive these days.

Go out and buy a 2GB card and swap it into your N810, fire up Easy Debian and download the image onto your new card. If you don't like it, oh well, no big deal. Delete the image file and put some videos on the card for watching on the bus.