I have been using my skills and knowlege with both Primary and Secondary pupils for years and witnessing wonderful results.
Together we identify what the problem is, then find the memories associated and change them, using tapping games, art work and visualization.
I teach them strategies to use in the moment to relieve stress and emotions and guide them to look for the positive, so they can be happy for no reason.
Pre school children 2-7 I would recommend working with parents and care givers as they are still a sponge at this age and will change as the adults change.
Children aged 7-11, I would work with for one hour. Young people aged 11-18 for one and a half hours.