I don't know if this site has been mentioned here before but I don't think it has because I did a search on the key words and couldn't find any evidence of it. It has one of the best explanation of the hows and whys of collimation I have so far come across (ymmv of course).
I got a lot out of it, and I think other noobs will too. It's long, pasting the whole article and images into Word produced a 30 page document, but worth doing for me as I have printed it out for reference when I am away from the computer.
I'm not sure how I found this article, but I too endorse it and include it amongst my favourites list. The more you read and learn about collimation the more you understand it, and the less you fear it . With the reading behind you it's a matter of getting out there and giving it a try.
Collimation revisited
