I know I said I wasn't gonna post here again, but seriously dude...
It's way too hard to be sure something was the right choice/path/whatever.
Every action triggers a lot of future events which in turn trigger even more.
And say you are into helping people. Now if you were to take the board with nail a few too many times and ended up carking it, would you still be able to help others even in smaller ways?

Sometimes the 'right thing' may actually be the 'wrong thing', and you just don't realise because you're in the heat of things.