If you want a taster some groups like Wiltshire RoADAR run a number of informal sessions throughout the summer where for no cost you can get an appraisal and learn about the training before signing up. Like others on here I have done both. I was disillusioned by Salisbury IAM and found Wiltshire RoADAR, I felt they better met my needs and wants.

Whoever you go with embrace the training and you will massively reap the rewards.