I agree with Shivas, use your eyes, thats how "we" used to do it. I think all advice outside of your own two eyes is too much (lasers, pin sheets, green map sheets, course books, etc.) I understand how this is a great great benefit to the pros, but 99.8% of us are not pro's, and have too difficult of a time, simply, hitting the ball, the less information filling the 18 handicappers head, the better
IMO a pin sheet is more valuable than an accurate distance to the pin. The biggest difference being, the pin sheets will give you green depth, distance from the front, and nearest green edge. This is very valuable when planning your strategy - where to miss, how much green to work with, how much room to land it, etc. I always found pin sheets to be very helpful in this regard. Knowing a pin is cut 3 yards from the right IMO is more beneficial than knowing its 100 yards to the pin
I have never used a GPS, so I do not know if those can be programmed for a specific hole location, and allow a user to find information on green size and distance to edges. Also, I have barely used a laser guide, but I seem to recall only a distance to the pin. Please correct me if I am wrong