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You should be fine! My primary mirror on my old 8" Dob was literally speckled with lichens up to 1cm across, and almost transparent in places for a while, after it sat in a garage for a decade. I cleaned it up, and was still able to get stunning views of faint nebulae (e.g. the Veil) and galaxies, even though the mirror appeared a mess to look at. The main point being that you'd be surprised how poor a state your mirror can get into before image quality degrades a lot. I'd not recommend being as negligent with your mirror as I was, however, but a small scratch or two should be no problem!
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