need help w alternatives to hammering nails into the wall for a gallery wall

im not sure if this is the right place to post but i was wondering if there any better alternatives to hammering nails into walls, my mom wants to make a gallery wall in the living room but the wall she wants to hang it on is a load-bearing wall and is incredibly hard to hammer nails into and they all bend. we were considering blu tack/ prestik but some of the things she wants to put up is too heavy to feasibly be supported by it so any other options would be helpful