HI Kim
I wouldn't worry about being tongue tied tbh. I do the consultation whilst I am setting up and when the machine is on you generally can't really have aconversation anyway as it is too loud.
I would practice your moves in your head either whilst waiting for them to arrive or whilst you are driving to their house (I don't know if you are mobile or static) and get into a habit of doing it in a specific way, however it is easiest for you. I always do the same thing at the same time in the same wa otherwise I forget which bits I've done and which I haven't but I am a creature of habit and I am a bit blonde so need to be orgainsed otherwise I am in real trouble!
Good luck and it'll be fine. Put it this way, the client doesn't know how to spray tan and you do! Everyone does things differently and remember your are the therapsit and you know what to do, just take a deep breath and do it, you'll be in and out and done before you know it!:hug: