The OP has collarbone length hair so with that in mind I would suggest this method. Now I haven't tried it yet myself, but the results look good on the video. I would think you would be able to do this with collarbone length fine hair
http://www.youtube.com/watch?v=crQtB285riU
I would think that curling once a month with tongs would be ok, it just depends on how long you leave them in your hair and how heat affects your hair in general. Having thick hair myself, I can't really compare mine to yours. I'm relaxed about using heat once in a while (like every few months) and I really haven't noticed it causing any damage, but then I haven't got any heat free hair to compare it to.
Let us know how you go.
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