Shimmerz it fab stuff, I love it to bits and am really lucky to be on the DT! It is a very, very sparkly water-based paint which you can get as a spray in Spritz or as paints Shimmerz and Blingz (which is even more sparkly)! I use paintbrushes as well.
You certainly do not need to be an expert to use it. I would suggest getting Angel Wings as that can be used for all sorts of things it is such a versatile colour and way to add sparkle to lots of things and also on top of other colours. After that go for your favourite colours! Which if you are anything like me is pretty much all of them - hey ho!
Have you been to the Shimmerz blog (
http://shimmerzpaints.blogspot.com/)?