It makes no sense to me to tune while holding the bow differently. No sense at all, especially for a beginner. It can change your bow hand grip and your release. The dynamics are too different, and that can't be good. Shoot the way you're most comfortable holding the bow. For some it's vertical, for some it's not.
Wisconsinteacher, I suggest you try bareshafting at close range first, and look for nock left or right, high or low. I do it at under 10 yards, and don't worry about accuracy, just how the arrow hits. Shoot multiple shots to be sure you get a decent reading before changing anything. Your form and release have to have some consistency, and multiple shots will average out the flawed shots. OL's method is good for someone with more experience, I think, but for someone who can't group yet, closer is better. You can always do it OL's way later for finer tuning. You have to get your spine close before you can group.
Others may disagree, but it works for me, and has for decades.