screw or nail into old plaster wall

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I have to hang a chalkboard in my kitchen that has 80 year old plaster walls covered with fairly new wallpaper. I don't want to take a chance on cracking the wall. The back of the chalkboard has those slits with the bigger holes on both ends of the slit to slide it on a nail or screw. I know how to do it, but can someone tell me if it's less risky to my wall to use screws or nails? And any other helpful advise on how to do it with the least chance of damage to the wall -- like hand screwdriver vs power, drill tiny hole first if I use nails, etc.? Thank you.