Just finished a very hard weekend of floor sanding, here's a few tips
from our experience:

1. Remove the skirting boards if you can. Otherwise whatever you do
there will be a thin bit of unsanded edge.
2. Don't bother with an edging sander, use a belt sander instead to do
the edges. Worked for us.
3. The drum sander has spiky bits that will happily puncture the dust
bag if it doesn't hang in exactly the right place. Holes in the bag
are unpatchable even with the magic of Gaffa tape, and spray sawdust
everywhere. So...next time I'll get more bags.
4. The belt sanders come apart to get in the car (thanks Si!).
5. For sanding between coats of varnish, gaffa sandpaper onto an old
sponge mop-onna-stick.
6. After varnishing don't use a sackbarrow to move a storage heater
over the new floor, it will leave a track in your lovely new floor.
Argh. Fixed now though.
7. Food tastes a little odd with added sawdust.

Charlie