There are very few guarantees in life and the hobby is no exception. As an example, a gal may offer BBBJ but some guys will not get it for hygiene reasons or per their own request. It's always going to be YMMV. If you absolutely positively have to have a certain thing done a certain way on every appointment I am afraid you are going to be sorely disappointed with our little hobby...

The worlds oldest profession survived for thousands of years without the internet and TER.  You pays your money and you takes your chances.

YMMV, very true.  But if a particular item is important, be sure you are squeaky clean...  & select a provider who does bbbj consistantly.  Once you are on the sheets you can whisper in her ear.  However, if she's already decided it's cbj for you, there's really no negociating.  

Just as in any activity, you have to adapt to the conditions as you find them.  Personally, I find first dates to be exploratory...  second & beyond dates (if I get that far) are better.
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If a lady is bbbj then she will most likely do it.

Reasons for not that ladies have told me....

Skin condition on Mr Winky

Foul smell (wash under the balls not just the balls and penis)

Odd color of pre cum

Sores

And last but not least, a bush that they have to swim through to find Mr Winky.