Nothing dunder head about it. It often takes me many many hours to get a tune down. The one I am learning now in fact has a shortish acoustic verse but there are lots of small variations and I have been working on it for days. Just about nailed it at last and then onto the bridge. The whole song will take me a couple of weeks of 2 hours a day on it so don't beat yourself up over it. Keep working at it and you will get there