Changing institutions

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I've just passed the confirmation stage of my PhD, however, I am not all together happy with the institution I have enrolled in. My main concern is there are no real "experts" in the field that I am basing my topic in. This means that I don't have anyone to bounce ideas off. So I am seriously considering applying to continue elsewhere.

Has anybody else changed institutions? How did you find the process of doing this? What advice would you give?

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