I usually put some in the lid and tap off any excess when I'm using a brush. If I'm using my finger I usually don't really need to tap off, but still pour it into the lid first. I use a primer on my eye and haven't had any issues with fallout.
Answer: Carefully. Lol. Actually I open it, sprinkle a little in the top and dab my brush in the sprinkle. You can always add more but its much harder to decrease shadow once its on your eyes. That seems to work fine.
I'd tap it on using a flat brush or even ur fingers and then use a normal blending brush to blend the edges - they don't pack a punch but minerals are usually flattering and more on the subtle end of things!
I use soft brushes that they make for powder eyeshadow. Your ulta dealer should be able to lead you in the right direction for the perfect brush. It helps to put a little in the cap, swirl, and tap off the excess.