Practice :-) At first you spend a lot of time being really, really worried about what you say and how you say it and how it looks. Is it worth saying? Does anyone care? WIll someone think I'm an idiot? Do I have all my facts right? What the hell am I even doing?!?
After a while you stop worrying about all that stuff. You stop worrying if you spelled a word wrong or got a fact wrong. If you did, someone will point it out and you'll post an update. No big deal. And you know that some days you're not going to be very interesting and sometimes no one is going to care, and that's fine too. We can't have gold stars every day. When you relax and give yourself leave to be silly and wrong and uncool, wipping up a blog post every day or however many days a week becomes not so hard.
I blog every day at Tell Great Stories and have for more than a year. Most of my posts take maybe a half an hour to write? Maybe? Sometimes an hour? My first Wicked & Tricksy post took me 8 hours to write. I spent an entire saturday staring at my computer screen writing and rewriting and editing and rewriting. I had that terror of getting it all right and what if they don't like me all over again. Now I'm starting to feel comfortable tripping on my way to the stage.
You should totally guest blog again for us. Your post was wonderful :-) (Everyone should visit http://www.wickedtricksy.com
and read dios4vida's guest post :-) It is awesome!!!)