Great article
Fortunately, coming from a DRP/BCP background when I was in the corporate world, I have kept up with a lot of this. Documentation is the key. I have a database full of how-to's that anyone can follow.
I know a lot of people dont like documentation but I find it works best in the long term. Documenting builds or changes as you make them keeps you on track, especially if you are called away suddenly, you know exactly where you are, as does your successor.
Writing how-to's is similar to brainstorming, except you're doing it alone. I am always finding easier ways to do something, or add something I may have missed. This is especially good if you are learning a new topic.
As a sole proprietor it is important to continually review your situation. I recently decided to close down my hosting service and move everyone to a larger hosting company because I don't want them to be left in the lurch. I was making very little from hosting my clients anyway and it seemed the best option all round.
