Marking the markings–argh!!

So, I have gotten around the marking issue by using pins on crucial spots and avoiding really mark-heavy patterns. But I want to make some more complex clothes and marks are inevitable. I know there are tons of tools, and I have some -- white pencil, yellow Chaco liner, purple disappearing ink pen--but how does one actually manage to do the transfer of markings? And what do you do when your fabric is doubled to cut out 2? How do you mark the other side? I feel like this is a crucial bit of sewing lore that I never properly learnt. :-(