G Fred Asbell has some books and tapes on ISing. No matter the aiming method a good form foundation is an absolute necessity.

I would recommend you integrate a sequence into your shot and learn each step until you have it ingrained before you actually try to hit something.

As others have mentioned, MBB series is a great reference and especially #3 DVD.

Pay attention to Rod Jenkins and start out with at least a 7 step sequence.

A lot of people get tore up and argue over aiming methods and is absolutely a waste of time.

Actually, form is the absolute while aiming is a more subjective subject.

I would educate myself about the different methods of aiming and make a decision based upon your own goals and expectations.

My shooting has continually evolved over the years and has pretty much leveled out to the "Style" I prefer.