I wouldn't worry too much about the 250 or so updates. Just bear in mind it's going to be a massive load of 800MB or so; which is normal because Fedora will be updating each and every package that has seen some sort of update since the DVD came out five months ago.
Does this mean that it will actually soup up an extra 800MB of disk space? No, the new versions simply replace the older ones. Sure, a few new packages will be installed, too, just to avoid dependency issues, but not all that many. And maybe some packages have grown a bit in the meantime but, again, not that much.
Btw, it's a bit unfortunate you didn't do the update right after installing. When you do that huge update right after a fresh install, you can be sure there's a minimum risk of running into dependency problems; that's not so certain when you wait until you've done some extra installs and/or updates yourself. Normally, all you have to do is type:
yum -y update
and Fedora will take care of everything for you (I usually do that just before going to bed because it can take quite some time). But if there's even the slightest dependency issue, yum won't update anything and then you'll have to update each package manually - had to do that at one time: it takes even longer and it's a bit harder to do while you're asleep...
To answer your other question, all of openoffice is about 100MB.
Whether you can easily assign extra space to / depends on the way your disk was partitioned: number of partitions, free space left, sort of partitions etc, type of fileystem. Quite a few things to take into account.
Finally, let me tell you how to install from dvd without shooting yourself in the foot:
- have a look int /etc/yum.repos.d
- locate core-repo, updates-repo and extras-repo
- in each of these three files, you have to comment the first line that says "baseurl" (commenting = simply placing a # before the line); then just underneath that line (again for each file) you type:
That's what worked for me when I was still using FC5 and I suspect it still does.