becoming an ACT therapist

I am a bit confused with regard to what the minimum level of qualifications/training is to become an ACT therapist. A colleague who has a lot of clinical experience in mental health, vocational rehab, etc. etc., teaching certificates, counselling skills, a diploma in training and education in supported employment - although no psychology degree unfortunately - is wondering how she could go on about becoming an ACT therapist.

Is there a basic CBT benchmark criteria as a prerequisite to become an ACT therapist or could she just go to some of the training organised on the ACBS website?

I know there isn't a formal ACT qualification but I am not sure whether there is a pre-requisite qualification for it or whether there is a way of finding out how much her current qualifications and experience would contribute to this?

Any comments would be most welcome

Thanks

Alessio