When adding a room onto your home, what are the steps you follow, from beginning to end, as your own general contractor?

I’ve read the processes for being your own general contractor for building an entire house, but what steps can be excluded when you are just adding a room? What are the steps?

In my state, permits are required for additions and inspections are required at every rough-in. I have been working on my price list for all materials, and I have drawn up the plans in a CAD program – so the plans and materials are taken care of for the most part. [Well, the materials haven’t been bought, but they’ve been priced.]

The additional room will be two-story [two-story is allowed in this neighborhood], it will need plumbing for a tub, shower, two toilets, and three sinks; electrical; radiant flooring; and ductwork.