I can only answer form my experience with yogis and have never been shown how by a buddhist - but I suppose its pretty much the same...

a cotton ball in melted ghee (store bought is okay or you can clarify your own butter), soak up the hot ghee, roll the cotton ball around in un-melted ghee to get it even fuller - as it cools off/gets fuller shape it sort of like a narrow base heshey's kiss then set it on something to cool.

We used to make up bunches of them and keep them in a pastic bag in the fridge.

Hmmm...I've never experienced this to be a very complciated process.

Buy a huge tub of ghee at an Indian grocer (that's really all you should use that kind of ghee for). And, get wicks (also at the Indian grocer if they carry puja supplies).

Rub the wick very thoroughly with ghee so that it gets well absorbed.

Put ghee in your lamp container or whatever you are using as a ghee lamp. Stick the wick inside the ghee with enough of the wick sticking out. Then, light it.

Wash your hands. :)