I am in the process of making a blog dedicated to my diy projects http://www.yourdiyguy.blogspot.com . I have done many of the projects on instructables and have my own tweaks and insights that i will be putting on the site. This is how I did it and its easy as 1 2 3!
Step 1: Get Gmail
Setup a google account. It is easy and it is always nice to have an extra email account. If you already have one you can skip on to the next step. If you don't all you need to do is go to google.com and click on the gmail link. It will then guide you through the process of getting and account.
Step 2: Get a Blogspot Account
To get a blogspot account all you need to do is go to this link http://www.google.com/intl/en/options/ and click on the blogger link. Since you have already set up a google account you can use that as your login info.
Step 3: Be Creative!
Once you have started your blog you can be as creative as you want. Their are all types of tools and addons that google give you access to to make your website very unique. I know this is not the most fancy intructable out there but I hope someone gets inspired by it and my blog http://www.yourdiyguy.blogspot.com