Edit: I'm back! Updating the guide slowly, please read the first few introduction paragraphs as they explain a lot, and are more important than the actual step by step guide.
Since Steam released F2P games, lots of new players have entered the game, and CE prices have dropped dramatically. Now, since we have an Auction house as well, it is increasingly harder to be self-sustaining within a week. I have added some new notes at the end of this guide to compensate for this being somewhat out of date. Please check the MORE EXTRAS section for this new information.