Actually, yes, you do! You DO need an editor.
I am going to tell you right up front that I am terrible at self-editing. In fact, most people are bad at it, too. Have you ever written something, checked it, and then had somebody tell you about language or spelling errors after publication?
Yep, just like you, I have had this happen.
This is exactly why it is extremely important to have somebody you can trust to edit what you write. One of my clients recently did a site review and discovered that a bunch of theirs posts were written in the third person. It turns out that the posts were copied from press releases and slapped into the posts. The problem is that wording such as “they” and “their” is fine for a press release, but in appropriate for a Web page or blog post. The phrasing must be “we” and “us”.
Somebody to help review what you put on your Web pages can help you make sure you set the proper tone. If your clientele is top-level businesses you probably should not be using an informal writing style. In addition, you may wish to avoid phrases and terms that people are unlikely to understand. At the very least you should explain and define what you are talking about.
Did you ever wonder why so many writers do not capitalize “web” when they use it as shorthand for “World Wide Web”? Or use “internet” for “Internet”?
In the early days of the Web and blogging there was a fad wherein writers did not use caps. Some did you even use punctuation. So much text was put up that did not capitalize the proper names (yes, the World Wide Web and the Internet are real “things” and those are proper names) that the “fad” of non-capitalization has stuck with those items.
Now, is that a big deal? Well, yes, in some instances it is. If your audience is the type that insists on proper language usage (think English teachers, top managers, New York Times readers) make sure you use caps properly.
Remember this, you probably don’t want to be referred to as carol, jim, or slappy mcgurk, right?
This is where your editor comes in. Have the person helping you to go over your site and look for capitalization, language use, clarity of writing, and all that good stuff.