Reid, I've planned and booked two trip to Scotland without using a tour company, and its really not too tough. Two good resources to start with are:
a book called Golf in Scotland, by Allan Ferguson. You can get it here http://www.fergusongolf.com/
a website http://www.golfnook.com/
Both are oriented towards a person planning his (or her) own golf trip, but provide lots of information that would be useful even when working with a tour company. Feel free to contact me at email@example.com. You can also look at the Golf Travel Forum in tripadvisor.com, there's a lot of good information available. I know I wrote two rather lengthy trip reports there of my Scotland adventures.