No plan survives contact with the enemy. - Field Marshal Helmuth von Moltke It's got good advice if you are investing serious money or time. OTOH my advice is

No plan survives contact with the enemy. - Field Marshal Helmuth von Moltke It's got good advice if you are investing serious money or time. OTOH my advice is, if you project is of the throw-it-against-the-wall-and-see-if-it-sticks" variety, you are even better off. If it has a glimmer of hope, iterate. If not, move on. I have done the opposite and it's why I am a thousandaire rather than a millionaire.