Any plumbers out there who can recommend any guides to mastering isometric drawing? I'm a second year apprentice, but have been doing plumbing for my own projects for the last five years. (All you union plumbers can jump all over me now...) Seriously though, my night class doesn't get to actually drawing them until later this year or next year. (Currently, we're studying the IPC....yawn....) I've got a 30-60 right triangle, and have ordered a template, but must admit this is the most confusing part of plumbing so far. Any tips or books you can recommend?