Hi Brett - Purchasing Ultimate will not make the installation process any easier or harder. To decide what edition is best for you, check out this feature comparison chart - http://windows.microsoft.com/en-US/windows7/products/compare
You will need to purchase a full retail version (unless you have XP or Vista on your computer, in which case you can purchase an upgrade version) and do a clean installation. If you wish to save anything that you currently have on your computer, you will need to back up to an external hard drive before beginning the installation.
Hope this helps!
Microsoft Windows Outreach