To this, I can only add my female perspective, Vekell:
It's not in the size whatsoever. PLEASE don't think of it for a moment. In fact, some women prefer smaller penises, due to their own tinier vaginas. Yes, yes, yes, we all know it can expand to accommodate a baby, but seriously, there are some women who prefer a tiny banana to a bigger plantain. Also, it strikes me as very unprofessional by a provider to discuss her preferential penis size, unless it is so big that it looks abnormal..or so small she can't find it! Your size as you described it is nothing out of the ordinary, so rest assured there will be no remarks..unless you paint it or hang little ornaments from it
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As to getting "busted.." I'm not one to offer legal advice (I leave that to the folks at the Legal Corner board) but it would stand to reason that a provider would not engage in entrapment if she has pages of consistent, solid reviews which are recent. Also, a good way of being safe is being with a provider who screens very carefully. Yes, you may have to come up with some information such as work phone number (don't worry, providers are very discreet when they call to verify, if that's what they do,) or she may want to see your driver's license when you show up. But rest assured, the more they screen, the less chance for you to get into trouble. At least you'll know that she's not engaging in entrapment, because she will have screened her previous clients and avoided getting into such a compromising situation.
Also, I may be a little biased here, but if you choose a provider with some "experience," (euphemism for on the slightly "maturer" side,) you may wish to disclose to her that it's your first time. I would bet that she'd be extremely flattered that you chose her to be your very first one. She may take extra care not to be "mechanical" as NDGeekboy described it, or be sure to provide cuddles, hugs and kisses inbetween the other stuff.
As to getting addicted to providers in general after your first time..well, I suppose it's easy to fall into anything that doesn't require so much "work," other than paying money and getting exactly what you want. But it does seem to me that you want this first experience over and done with, and that you have decided to go this route. After you've enjoyed yourself and feel more relaxed about it, perhaps it will be easier for you to pursue dating in the civvie world. It's a thought and a theory, anyway.
Good luck and let us know,
the Love Goddess