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No, small nicks (if they're so small you can't feel the razor bump as it goes over them) don't really matter, I believe. Larger ones need to be fixed, and apparently you can do this with a dab of...

Having a styptic pencil is advisable when you're starting with a straight - larger branches of Boots do them for under £2, and one will last you a long time. (If you haven't already got one.)

I'd...