Let someone else beta test MS's stuff until the kinks are worked out, I wasn't about to do it.
You don't have to uninstall Windows firewall (I doubt you could without serious tinkering anyway). In fact, a beefed-up version is one of the things SP2 is going to install.
If you use the Windows Restore thing, set a restore point.
Before you do a major update, it's always a good idea to back up stuff you'd really regret losing. Docs, files, pictures, movies, music, whatever -- if you'll shed a tear when it's gone, burn it to disk. And check the copy on disk to make sure it took.
Download driver updates for your devices. You can get your printer driver here:
http://welcome.hp.com/country/us/en/support.html?pageDisplay=driversYou can install them right away, but I'd hold off if everything is already working to your liking and trouble-free. Sometimes new drivers can introduce problems of their own or install new "features" that you might not like. But driver conflicts are not an uncommon source of trouble after an OS upgrade, so you'll want them on hand. Burn them to disk.
Now's a good time to update any major software you regularly use. Visit their sites and if your version is behind and there's a free update, download and install it. And again, burn it to disk to be safe.
Hold your breath and do the SP2 upgrade. It should be painless, it is more often than not anymore.
After the upgrade, you might have to "retrain" the firewall. I'm not sure, I always disable it and use 3rd party software. But you'll probably see alerts, "Windows firewall has blocked this or that, blah, blah" until you get it set to recognize your devices and software suite.
If you use Internet Explorer, it'll be more annoying than ever, spawning alerts and warnings every which way. This is a
good thing, though the implementation is hamfisted. If you can't get used to it, you might want to look into some of the other fine browsers available, like Firefox or Opera.
SP2 also updates some of your media software, like Movie Maker and Media Player 9. So, expect popups urging you to install the downloaded updates when you click on a media file.