sweeney todd?

so, my friends dad is going with her to go see sweeney todd and he said he would bring me if my parents let me (im 13) so i asked my dad, he said it was fine. but he also wants to go (idk y....he wants to see it? he wants to protect me??) anyway, its rate R b/c of blood and gore, im not good at watching scary in ur face make u pee kind of movies. im ok with scary concept movies like signs and sixth sense ( those arnt even scary) anyway, im kinda wimpy like that. but i think im ok with blood. but, just how gory and bloody is this movie?? would i b able to cover my eyes in time???