Because someone has to tell you, apparently.
1.2.1.1: Make sure you have a flowchart, or at least a Venn diagram, or maybe just stare at a wall for a while.
1.2.2.1: If at first you don't succeed, try, try again. Or just wing it.
1.2.3.1: If you're still confused, just ask a lawyer. Or a priest. Or a therapist. Or a bartender.
And that's it. That's the entire guide. Don't come crying to us when it all goes wrong.