Are you kidding me, upgrading a computer is like heaven. (Outside of the spending lots of money). If I know that my computer is going to be out of commission due to an upgrade, I have no problem. (I mean I still have my laptop) I love troubleshooting while I get the thing up and running.
Granted while I'm an enthusiast, I recommend that you do your homework before you try to tackle any sort of computer upgrade project. Otherwise you'll just waste your time and money.