http://www.youtube.com/watch?v=RAk9lKv03zA
should be ready in about 50min per youtube, covers snow/color killer adj, fine tuning and matching transformers.
One last thing, always think the easy problem 1st. Make sure you VCR is putting out a good clean color pic. See if you have a Known good working tv set and use what ever you cable/transformer setup on that (eliminate as many variable as possible) to confirm you are getting a good signal. Before the loss of analog tv this was easy, now you are forced to use various RF modulators (built into VCR or separates) that may or may not be so good.