Screw your courage to the sticking post and you'll not fail, as Lady Macbeth said. And the same goes for blogging.
You have to keep plugging away telling it like it is if you want to build up any kind of readership. Don't lose your nerve, he honest, take chances. Just like writing a novel in fact.
A guy who really speaks a lot of sense on this subject is Kent Newsome. He's come up with a theory of "Four Reallies" which makes a lot of sense to me. Him and the Grumpy Old Bookman are the two blogs I read every day without fail.