I have a house built in the 50s. I suppose they used nails instead of screws when putting up the drywall? All over the entire house I can very faintly see the nail heads coming out. In a few places, you can see the paint begin to crack ever so finely around the head.

One friend said to carefully chip the paint away from each head. And then to carefully pound the nail back in further, then spackle. And then begin painting.

What is the correct way to handle this situation? It's on every wall if I look carefully and I'd hate to repaint and then have all my hard work marred by these flaws.

thank you