spongebob scaredy-pants

Well the SP2 update has been sitting on my computer at home. I have XP professional and downloaded the update a few weeks ago. Scoble says it is safe and recommends the download, but I'm just not ready. I almost did it last night, but I don't want to fight the problems that it can cause. Should I go for it? How long does it take to install? Are people still having problems with the install? I need to put it on Laura's parent's computer too at some point. Shouldn't I test it out on my computer first?