There are a number of different methods... Upper Cervical techniques, as well as instrument-based techniques are advised. Here are a few:
Upper Cervical:
Blair, NUCCA, Grostic, AO, Palmer Upper Cervical Specific
Instrument-based:
Activator, Pro-Adjuster, Arthro-Stim
Adam Tanase, D.C.
www.drtanase.