Too much DIY will kill you

Too much love will kill you. Well to much DIY can kill your career too.
But how much is too much? Some DIY is necessary to even become a good artist. So where to draw the line to find a professional to get your stuff in the right direction?

This discussion is really not easy but the last couple of days I bumped into quite many of these with a bit too much and the mindset of keeping it that way. The reality is that I see so many mistakes and loss of money while they haven't even got the rehearsal room in the basement.