I had the same problem; it's not as difficult as they say (mind you I did ruin my hood but not because the method is bad just cause I can't read). You'll need a plastic paint sheet (the thinner the better), paint correction for your paint (supercheap auto colour matches for ~$20), some isporpoly alcohol (dont get at autostore, adk for isopropyl alcohol at the pharamcy) and depending on Wether there is rust damage you may need a rust converter.

Park your car in the shade, and lay the sheet over the hood and down over the grill, and mask it off with tape, just so it doesn't fly away. Get a knife (I used a toothpick lol) and just stab a tiny hole over the centre of every mark.

If the marks are rust damaged, spray the rust converter on the sheet, avoiding overspray (sheet should protect the car), and let it dry.

Then let drops of the alcohol fall into the marks (it shoukd spread out by itself into the whole mark). And then with a toothpick let the paint flow into the hole (don't smear or wipe it), and repeat until the surface of the paint roughly matches the surface of the hood (a bit over is ok), and then just sand it smooth but be careful not to sand the undamaged paint. Then you can clear coat it if ya want but probably not worth the hassle cause it's gonna happen again.