Use your blog to motivate you to succeed. You don't have to bare your soul or anything - but if you want and need support - that is a great place to get it.
You choose how much information you share, but it is a good place to keep track of your goals and to plan your path. If you aren't using it and you aren't succeeding - give it a try!
I have seen many different blogs out there - and the people that seem the most successful - blog about their journey. Those that aren't succeeding - may not be using this tool to their advantage. Use it to communicate triumphs and mistakes - and use it to help you succeed.