My grammar is not strong. Can I be a great proofreader?

I would like to try out being a proofreader, perhaps even a copyeditor some day. I enjoy reading and notice mistakes well, but I also know I am quite imperfect. I get by getting my point across surely, but, my grammar skills could use a lot of polishing up. I have always felt more comfortable with "what sounds right" intuitively than with learning grammar rules and regulations which I am more likely to forget. Even then, there are many instances when I get stuck when writing something not know which word should be plugged in. I think I have a long way to go grammar wise. Do you think I can be a good proofreader and I just have to work very hard at it? Or is it something that's not for me. I am a casual, expressive writer, and I enjoy doing that, without much thought, but I am not a writer writer.