Tinkerbell- I would just say in your email that you do want to set up a lesson, as you are trying to find a coach who is a good fit for you. That way they know you are looking. I would see no problem in using the word trial, except that the coach might expect you are looking for a freebie.

When I emailed about private lessons I asked flat out "what are your rates"

I see no problem in telling a coach who emails later that you found another coach if you are happy with one you took a lesson with before they contacted you- but I'd tell them politely (and do tell them, don't leave them hanging) so you don't burn bridges when you might need to change coaches.

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-Jessi
What I need is a montage...
Visit my skating journal or my Youtube videos (updated with 2 new videos Sept 26, 2009)

Thanks. Very helpful advice.

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"Anything worth doing is worth overdoing." (Kathy Butler)