I have hung pictures from a brick fireplace, before. Yes, it is a good idea to use a drill & to use cement screws, because these can easily be removed. Also, I would drill into the mortar between the blocks or the bricks. Then, it is a very easy fix to fill the holes with some mixed cement! I wanted to hang a picture above a fireplace & this did the trick. You also could use a cement nail & nail it into the mortar, but get a very strong friend to do this for you! ha ha. One of the down sides of doing this is that it can’t be easily removed; without doing damage to the bricks or the blocks. Dont be afraid of a drill. Really, they are one of the easiest tools to use. Good luck!