I use this to help my DD focus too. I found the best route for us was to just order the roller version from doTerra. I rub it on the bottom of her foot, rub the bottoms of her feet together, and then put socks on. One roll across her foot seems to be plenty. As strong as the essential oils are, 1 drop is usually plenty for most kids. One roll across the back of the neck would probably be about the same amount of oil used. With daily use, the 10 mL roller lasts us about 3 months. Wiith my discount, I figure it costs us about $12 to $15 month. *I also noticed the roller blend was available for a discount price on Amazon (plus no shipping) if you don’t know someone who can order it directly. HTH!