I have several of the top powders, and this is one of my favorites. A little goes a long way. I use a brush, because my skin is drier as late, and I find this powder is mildly drying. If you have oily skin you might prefer to set your powder with the proper powder puff they sell at Laura Mercier -- it's good -- or one that is similar. For T-zone oily skin it's good to almost roll the puff into the pores. I'm not sure how to explain this, but you basically tap excess powder from the puff, and then wrap the back of the puff kind of tightly around your fingers and press down the powdered surface into the oil-prone skin, and roll it along it along -- in a down-pressed motion, without picking the pad up, or pulling it at all, so as to not smudge your foundation/primer/concealer beneath)... So hard to explain with words... I'll try again: so you kind of wrap the back of the puff around say two fingers, and then it's taut with the powdered side out, and you take the left side of your fingers and press the powdered side into the skin and then while continuing to press the powder directly down (not pulling or lifting, as this will smudge your makeup) roll the front side, all the way to the right side. This is a good trick for oily zones, as it bonds the powder with what you've got underneath a bit more than a brush (which basically sits the powder on top of the skin). I'm sorry I can't explain it better. Anyway, hands down the best primer I've found (and I've tried almost all of them) is the Bare Minerals/Escentuals Original Prime Time concealer. I really like the one they have come out with that has a tint, too. It works so well to erase pores and imperfections, and I can't recommend it enough to everyone, so throwing that out there, too. :) You might try to put the powder on the t-zone with the puff, and use a brush to apply to the rest of your face (lightly). Honestly, I would avoid using too much powder under your eyes. It will dry that area out, and potentially age your skin. Just a really light dusting with a brush under that area if you're keen -- this powder is a good choice if you are going to do so. I've also got the Mac powders, and the mineral ones just seem to evaporate, and the Studio Fix can be extremely heavy (and lead to break outs). I hope some of that made sense. Hard to explain in writing. :D