If you see your book in your house or apartment or the residence you are visiting this holiday season, you are allowed to do the same.
Of course, try to do all this when no one is looking, when no shopper or relative or spouse or stranger is around. Above all else, do not allow another author to see you in this revising state.
Do not draw attention to yourself when you cross out and write in your published book.
Red or black ink only, please.