I like to find the spot of a known distance. I sit in my backyard and look at a stake that is 30 yrds while I am relaxing to inbed 30 yrds in my head. When I get to a target, I will find where 30 yrds is at ,and then go from there to estimate the distance of the target. I find that most targets are between 25 and 35 yards. This will break down the increments in which I have to judge. I will then split the difference of that judged yardage and estimate that distance to be sure of what I just checked. I will take this method and a range finder, and go ranging 2-3 nights a week. Make a scoring system to see if you both are improving and make a game of it. If you are right on, give yourself an 11. 1-2 yards off, give yourself a 10, etc. etc. etc. I have found that making a game of practice helps alot. And by keeping track of your ranging scores you can find out if you are improving or not. Good luck and tell the youngerster, welcome to the sport of archery.