As a very well respected artist in the industry - In Europe and the US - I might be able to help you with some of your questions.
As for Not_Punny's post.. Yes and No. Finding the right arist is very important, and I could not agree more. Remember though, the APP does not nescesarily say anything about the skills of the artist, but does tell you they worked up to high hygiene standards when they were beeing tested. These studio's have to send in monthly spore tests, which they should be able to show you if asked for. Though, without any knowledge of correct studio hygiene and protocols, I do realize results might be hard to read. Do not be afraid to ask for explanation, you are entitled to it.
Next, jewelry. Never settle for anything less than perfect. All jewelry used has to be sterilized and preferably internally threaded. Ask for anatometal, or at least neometal - high quality jewelry might cost more, but heals faster and can be worn lifelong without any problems. This is vital. A lot of studio's will use stainless steel, which contains nickle - always ask for implant grade titanium! This is a lot lighter and anti-allergic. Again, di not settle for anything less. Other acceptable materials are Niobium, 18k gold and lime glass. Silver and most white gold are not (except white gold with paladium - don't be fooled: very hard to find and very expensive).
As far as the internet goes, it doesn't take too much knowledge at hand to know that there is A LOT of bullshit on it. You're better off asking a reputable artist, than reading atricles online from people that think they know better. The internet only has valuable information AFTER you know what to look for!
I don't really get the "diferent types of piercing" when talking about a vch. There are indeed three methods (clamping, NRT and freehand) to excequte it, but all can result in a perfectly placed piercing in the hand of an artist that masters the technique. Placement on a vch is generally quite standard.
It's also is advisable to check on forehand to see if your anatomy suits a vch, seeing not everyone's does for every genital piercing. A q-tip test usually does the trick: try to place the tip op a q-tip underneath the clitoral hood, if you can fit it easially you'll probably are suited for a vch. If not, ask your artist for advice.
Whether it's worth it, is hard to say. When placed correctly most woman find it to be pleasurable. But that does never mean you could not be an exception.. NO artist could give you that garantee.
If you'd need help finding an artist, you could always ask me ofcourse, but I would need an area.. The states are big, hm. Elayne Angel has some good info on vch by the way, you could look that up.