Just practice...As you walk look at an object ahead and guess the yardage, then pace it off...At the stand site, mark trees, use one slash or orange tape for 10 yards, 2 for 20, etc...When you practice, move around, change where you shoot and don't pace it off...Finally, we used to use judo points and walk through the woods and shoot at objects or even squirrel and rabbit hunt with our bows...After awhile you'll realize there is really no need for a bow finder, especially with today's bows...