Belle, the best trainer I've worked with was a guy in the UK called Jamie Smart at
Salad: Provides training and products relating to NLP, Influence, Hypnosis, Happiness & Success Check out his site and subscribe to his weekly NLP tips letter. Alternatively, check out
NLP Comprehensive - Information and Training (and their weekly newsletter too) or just read anything by Richard Bandler, John Grinder, Robert Dilts, the Andreas's, David Gordon et al.