Elkguide the system I use is no longer in print but found it was based on the Bates method which is available on Amazon for about 12 bucks. "The Bates Method for Better Eyesight Without Glasses By William H. Bates" Hey, worse case you'll have a $12 book to burn. or....
Yea, its a good system. I paid over 300 bucks in the 1990s for videos, tapes and all this other crap when all I use is a couple pages in the book. but it was worth the 300 bucks to me so 12 bucks is a bargain.
A $1.99 pack of garage sale stickers a black marker and a 1 mm leather punch is all you need. Stick that in the corner of your dominant eye so you can see through the hole. With both eyes open you will be able to cowitness your peep, pins and target perfectly.