For cheeks, you just use it the same way you would any powdered blush. For super-pigmented shades a fiber optic brush makes it easier to apply in a natural-looking way.
For lips, you generally need a base of some kind. You can use any clear balm. Some people dip the balm in the powder and apply, most apply the balm and pat on the color, smoosh it a bit and reapply. You can try mixing the color into the balm before application, but i find it difficult with wax based balms
You can also use something like a clear sticky gloss(liquid) or a just straight castor oil (which will not be very moisturizing but will work very well). For those you put a drop or two on a mixing palette (i mix on the back of my hand) and shake some powder into the liquid, mix it smooth, and paint it on with a lipbrush. Something like SN's coy will take a red plum and mute it into something of a vintage rose color. SN offers a clear liquid gloss and a milky liquid gloss that are both great for that.
*I prefer liquid bases for turning pigment into lipstick, but i also recommend using a liner (even if it's just a clear wax liner) with liquid lipcolor
Anywhere makes for a much cooler toned purple/mauve lippie than I would probably wear, but I'm also pretty warm. I demo'd with SN's Coy because I don't have clear, but SN's clear isn't fundamentally all that different from a liptar (they both use castor oil and a second more moisturizing oil- SN's will be more moisturizing, and liptar stays put longer)
(This is way more gloss than you need, I was just doing a demo)