Is it hard to learn just how to squeeze that little bottle through the hole in the wood?
Not at all. I just draw on it at the same time I squeeze, and as soon as the draw tightens and/or gurgles a bit, it's good to go.
I like the AMG Hybrid Bottom Feeder from Vapage (also available at COV) atomizers. It's a debridged 306 atty in a 510 sleeve. This gets rid of the burnt taste I associated with a lot of other atomizers.
If you prefer the carto flavor, it works just fine, too. Just fill it like normal before putting it on, and then feed it like above.
In either case, you'll probably take the tip off and look inside a hundred times for the first couple of days, but it becomes second nature pretty quickly.