Do company websites and newsletters require an editor? "We do indeed judge people and companies by the quality of their printed material, and image is very important in business, as well as in life in general." ~ Bob Lamb Errors in your presentation copy can easily give the impression that the rest of the work you do is sub-standard. You are losing business needlessly.
Do charities need an editor for their newsletters? Yes, and although the budget is usually tight, you might be surprised what I can get done in an hour!
How much self-editing should you do before submitting your piece to a professional? As much as possible. It is not our job to totally rewrite your work or do your research. When you are paying by the hour, submit as clean a project as possible.