Remember that most providers are very good at faking it in general -- and that is particularly the case when you are DATY.  It's actually pretty easy to tell if they are faking it if you have ever actually DATY with a non-provider to completion.  My W and I do it, for example, to completion -- and it takes quite longer than a provider might pretend with you that it does (after all she is trying to keep things moving along) and is more intense.  If you want to tell the difference, focus on her breathing (it should get longer and deeper, not quicker and shallower) and the tension in her muscles (her muscles will likely tense, esp the legs).  So, DATY technique with providers seems less important (at least to me) -- for the most part, they are going to react in a more or less scripted way regardless of what you are doing.  Sure, if you have a good technique, give it a try, it will be more fun for you anyway -- but don't fool yourself into thinking that her reaction will be much different from what it would be if you were using a less well-developed technique.  

I know that many hobbyists really like to think that the provider is aroused and into it (and in some relatively rare cases she may be) -- and I guess that's why some providers spend so much effort trying to fake arousal -- but I would think it must be irritating to providers after a while.  I mean, as long as the hobbyist is into it and is enjoying it, and the provider is participating actively (and not simply lying there, etc.), why does it matter if she is really aroused or not?  It must be really irritating for the provider to be put under this kind of pressure from numerous hobbyists, but that's just my $0.02.

There used to be a show on cable called "The Man Show", late night, based on the premise that all men like to guzzle beer and watch busty vixens jumping on trampolines.  I normally didn't watch this show, but surfing one night, they had a 40ish female "sexologist" as a guest who was there to instruct us guys on proper technique for cunnilingus, half serious, half tongue - in -cheek. Before you start posting, I don't know how to do it with my tongue in my cheek, so don't ask!

She described the appropriate motions as actually creating the alphabet with your tongue, the point being, I guess, that the changes in movement, speed, pressure, etc. was what gets a woman off.  Also paying attention to all anatomical areas, and not just zeroing in on one spot.  Having tried this approach, starting with the letter A, it still varies from woman to woman, but it is a good starting point because going through some sort of excercise like this may allow you to find one or two things that do excite her more than others, and then you can adjust your approach.  

You can use any alphabet you want, Arabic (ours), Hebrew, Cyrillic, Chinese.  I like International Morse Code. LOL.

BTW, the second part of this show was on how to find the G-Spot, which included a set designed to look like the interior of a vagina, complete with one of the guys walking around inside, wearing a miner's helmet complete with lantern.  It was really funny.