I don't real much of Tim's stuff, but I don't think he says you need 'willpower alone'. He says you need to work hard for success. Wishful thinking will get you nowhere. I'm not a particular fan of his content, but it sounds like you might benefit from sticking to subjects you know, as you've said you make mistakes. Quite big ones, by the sound of it. I think it people really are pushing bullshit, we should just learn to not read their stuff.