No, it is not easy, if you don't know what you are doing, don't even try. :\
Down to the paint, then you need the original colour code paint, plus clear coat, and 3000 or 2000 grade sand paper, for a minor scratch.
Down to the metal? That is alot of work. No matter the size of the damage. On a large nice panel, it's almost impossible to fix a scratch that deep, without you seeing it when you run your eyes over it. The entire panel really needs to be repainted.
The thing is, even if you fix it halfway decently, when you run your eyes over that panel, you will noticed where you "fixed" it, if it is anything but perfecly done. So, all those, minor scratches and dings, either you leave them, or you bite the bullet do get it done properly. Anything inbetween will not yeild a good result.
I've painted plenty of glosscoats, so just take my word for it. Some products will temporarly hide the damage, but the first wash, it all comes off, and probarly more in the grove, you damage the edges of the original damage, so each time, it will grow.