Hiya Trev, I asked a similar question in my thread about
colonial troops, and
@Steve Ski left a few pointers which I have found helpful. They are more about oils, but not all.
I have also consulted a few books, I found this one very good as newbie, but after a while different sources and UTubers start providing redundant advice.
My approach us to pick one that seems reasonable, and doable, make multiple attempts, and go from there.
Other folks on this forum often remind us (in other threads) that if you really goof up,
there are ways to remove that paint and start again!
I've posted it elsewhere, but here is my horde of Italians who volunteered to help me learn how to figure paint. Hopefully by the last one, I'll have learned something!