I offer the opinion that you went wrong by wanting to install Windows in the first place - -
"something I had to do that wasn't said in the guide?"
What could that be?
The correct partition to choose will be the C: drive - and you can double-check by knowing approximately what size you chose to make the partition. I like to format NTFS (Quick), then the install happens. The computer reboots at completion, and you would see (briefly) "press any key to boot from the CD" which will start the installer again, and mess up your great install. You don't want to boot to the CD at that point, so don't press a key when you see that screen, just keep hands off unless the install asks for input, or to make choices, don't make changes to the default install unless you have experience with Windows installs. Mostly - don't press a key when the Windows asks you to 'press any key to boot to the CD' - it's a poor way to initiate you into the marvelous world of Windows.... (not an Apple or Boot Camp issue), and Microsoft does all that to help you
