You can do the simple 1 color stuff with a Bic lighter and a brush. You can do the complicated multi-color stuff with a Bic lighter and a brush.
The process is very simple and only limits are your imagination and patience.
Best tip i can give is to NOT overheat your jig head. If you do, it allows the powder to stick to the lead too quickly and makes for too thick of paint. The toughest, most durable paint jobs are when the paint is at its thinnest and i have seen where it will dent along with the lead before it chips or cracks - got to keep it thinnest possible coat.
A lot of people prefer heat gun and i think mostly for the heat control. I personally use an oil lamp - had melted a few heads right off the hook when i first started - but have gotten a system worked out so i know how far from the flame i need to be to heat it slowly and evenly.
It all takes practice and is fun figuring out what works best for you.