Figuring out iMovie

Whoa, I know it has been a week since I have posted. AND I promised video clips of my recital. The good news is, they're coming. I just downloaded the rough cuts of my recital onto my computer and transferred them to my external hard drive (because, man, do those digital video clips take up a TON of space). I will hopefully have them up starting Monday.
Until then, I will have to figure out how to use iMovie. This is a Mac program, so it should be user-friendly, right? I mean, why am I having trouble with this?