Editing my terrible paper

I had to go through and edit my papers for english about 7 times before I finally got it right. I went and went through spell check and had my room mate look at my paper. Editing and proofreading are not some of my strong points. I could comprehend and read really well, but when it comes to actually wighting the paper or words I suck. It goes the same way when I try to help proofread someone else's paper I just suck.