Coyo already said most of it. I would just add short snippets.
1) Don’t worry about it too much, you can use that sparingly to sketch out difficult areas and that way clear your view a little, but sketching too broad of an area would just be too time consuming. Like the downside of eating a clock, it’s time consuming 🥁🥁
3) I’m guessing you mean how not to burn out. Its a tricky one, that’s like a whole psychology business. Everybody has burned out, it’s important to take breaks and then getting back to it. Breaks that are too long are dangerous.