Hello jmcl,
Welcome to HaarWeb. It's no problem you write in English, since most Dutch people understand it very well.
I have moved your question from the Haarwerken/camouflage forum to this forum, since I think it will get more attention from fellow TTM-ers over here.
So hopefully, one of them can point you to a good hairdresser.
And yes, occasionally meet-ups are being organized, for example this one:
http://www.haarweb.nl/forum/showthread.php?t=31875
I wish you good luck in finding an appropriate hairdresser that you feel comfortable with.