Cleaning my laptop

So for the past few days I have been digitally cleaning my laptop, backing files up and deleting files I've backed up, but no longer really use on my laptop.

Now, I am ready to open my laptop and clean out all the dust and gunk that has collected over the past 4 years. Okay, I know... I'm so bad! But I never did it because I'm afraid of actually opening my laptop and breaking it because I don't really know what I'm doing. So I'm taking it to a friend's house. She's a computer person and she will help me clean. I'm always thankful for friends who specialize in areas I suck at. :)