I think the best blogs are where you're putting what you learn. Like how to install the tools. Or how to store information. Use it more of a Notebook for your notes as you learn. As far as people stealing your ideas, when you go to other people's blog do you think as though you are stealing their ideas?
I've heard more then one blogger say that while searching for something that they needed to know, they came across the information in THEIR OWN BLOG! I would love to have a day like that. So while you're learning, write it down. Yes someone will come by and learn from it, and that someone might be you!