Here is a link to a video tutorial on how to add drop down menus to your blog. It was relatively easy. I actually did it myself! I have been wanting to add this for a long time, but it has been super intimidating. And I was afraid of losing all my information. Some of my pages are still in progress, but it only took a few hours this morning to get it done.
Ro is easy to understand and very likeable. You should go check it out. She has more free videos on other aspects of your blog too.