Hi Sidewinder, Did you go yet? I am in NYC and have gone to Didi once and while I'm glad I did I probably wouldn't go back. I would say that she can help you get over the hump and learn but she is kind of old school in mentality and approach. So speaking for me and guy I saw walking before me don't expect to come out of there with some undetectable modern style.

As for your specific questions:
1. Yes, wear your piece in and she will detach it, shave, attach new one etc.
2. She will have supplies but if you use something special for a detach (like autoglym or something) it couldn't hurt to bring it just in case.
3. see 1, she will cut it in fully. just bring the new piece with you in a backpack.
4. She does have a private room, completely isolated which is nice.
5. It's expensive, and don't expect perfection, but it will jump start your learning.
6. She is very skilled at what she does, but she is definitely old school. For instance, she was pretty taken aback by the low density I wanted to wear (which was actually medium density).

Hope that helps and let's get in touch if you want to discuss further.