Need help hanging a framed artwork on plaster wall

Hi there, I’m looking for someone to hang a framed painting in my living room. The wall is plaster with a standard stud behind it, and I’d prefer using a wall hook appropriate for the frame weight (about 4–6 kg). I already have a wall hook and picture wire, just need the right anchor and skilled placement. The space is about 1.5 meters from the floor and I’d like the picture hung at eye level, centered above a sofa. If possible, please include guidance on avoiding nails showing on the paint and any safety considerations. I’d appreciate a quick consultation today or tomorrow to confirm the best approach before you mount it.