I taught myself,,,back in 1984,,,,I did have a few roll-overs,,,and subsequent blade,damage,,,,BUT,,,,I am still at it, still flying,,,and feel comfortable with the way I did it.
I know of others that took training ,,,several,,,and after it was all said and done,,,,,most if not all had roll-overs,,,blade strikes amd subsequent machine damages,,,so,,,what's the difference? In my opinion ,,,,,none!
Go by what you feel is right for you,,,,If you want training,,,get it,,,if not ,,,don't!