I have permanent scratches on my real screen, which I am sorry about, when I remember to be. They really aren't that bad. But I wish I had gotten a real screen protector. Now it's too late.

Screen protectors seem to have varying degrees of usability and ease of application, so you might search for information on which are recommended. I remember seeing threads on that subject.

By the way: It is really difficult to scratch the real screen, and I think that real screen protectors are also difficult to scratch. I had to go the limit to scratch my screen. I think it involved dripping some honey-like foodstuff on it, which I quickly wiped off, but which bonded with my much-worn lower right secton of the screen.