So just roll it to a point? Fatter at the top and thinner as it goes down. Enough to touch all of the coil but not so much that it plugs it. I learned that lesson tonight haha, on one attempt I rolled it so fat I almost wrecked the coil pulling it out. And it started to get burn marks on it too.
It takes trial and error. But I use a piece of cotton that's the same width from top to bottom and I tight roll it up to where it'll rest in the coil. Work it through the coil into the tank. Sometimes I have to inch it into the tank with a tiny jewelers flat head. Then I take the jewelers flat head and fan the cotton out under the coil and in the wick hole. From there you can drip on it and fire it a few times to see how it works. This also helps break it in.
This is a twisted coil but it'll give you an idea -