Hi philanopsis
Below is an old article in Physiotherapy on the Schroth Method:
http://www.easyvigour.net.nz/pilates...2Treatment.pdf
The technique has some good evidence for preventing further deterioration and improving Cobb angles. However it sounds like you have to intervene before the end of puberty to be really effective.
Below is a systematic review that examines the Schroth Method and other techniques for Adolescent idiopathic scoliosis. As the results of the review are positive it would be well worth you getting it and examining what they did in the clinical trials:
PEDro - Detailed Search Results
I am not trained in the method but it does sound a lot like other somatic education methods like the Feldenkrais and Alexander methods which I am trained in. These methods require considerable investment in time and you first learn to work on your own body awareness using the technique before applying it to patients/students. Someone more knowledgable on the method may give you better advice, however it sounds like it would require quite a bit of training to practice the method effectively. Such methods usually do.