Blogger Template Designer is very helpful and lets you tweak the blogger template without any fuss. Even if you don't have much idea about templates, this guides you visually to tweak the template as per your need. Template Designer provides a shortcut way to add custom css code to blogger template and the css code added will be attached to the blogger template file directly. Here are the steps to do so.
"A Blogger Tutorial discussing about methods to remove/hide the top navigation bar of the Blogger Blog"
Blogger Navbar will be helpful in so many ways and lets you sign in to your blogger account and edit the blog directly from your blog. Also it increases your blog visibility by adding your blog to the blogger's blog list and there is a lot of chance for anyone to discover your blog by clicking on the "Next" link provided on the navbar. You can even search for your favorite blogs too.