Macbook pro doesn't have it. So, for setting up bootcamp; is it better to run bootcamp assistant or take it to the mac store? My only argument for taking it in is that I don't want to screw it up. Or is the bootcamp assistant that good? And if I only want to do it to play PC games how much should I set aside?
The Boot Camp Assistant allows you to set whatever size you think you need for the Boot Camp partition. I think that 60 GB should cover most needs for Windows, especially one where you don't particularly need a lot of space for games.
If you are running 10.7, then Boot Camp is really optimized, and really only supports Win7.
If you want to use an older Windows, then you can find some help on that by googling for Windows XP Boot Camp on Lion
An article like this will likely help, if you need XP: http://telastipes.blogspot.com/2011/12/yes-virginia-you-can-dual-boot-xp-and.html
That makes almost no sense at all.
Bootcamp assistant comes installed on Macs since OS X 10.5
Its main purpose is to assist the user by creating a partition where you can install Windows.
If you already have Windows installed, then Bootcamp isn't really needed.