When you're building websites to generate income, remember these two things:

1. It never has to be perfect, and if it is perfect you've wasted a lot of time.
2. Never stop producing new pages, new sites, and new products.

A very common mistake is to work on a project until you find it absolutely perfect - this is a tremendous waste of your time.  Work on the project until it generates a nice stream of cash for you and then move on to the next project.  You can revisit your earlier projects to test new techniques once in a while, but never stop moving forward.

Another mistake is to finish a project and then wait until it produces income for you before you move on to the next project.  This is a huge waste of time - it will often take months before you see any sizeable income from a new project.  In that time, you could have produced several new projects.  Always keep producing new sites, new content, and new products -- don't stop for anything.