Please my opinion is to take that advice with a pinch of salt because when you have spent years learning the skill of trading and it doesn't seem to go well for you, I advice you get some other skills that might work for you.
Most people think that since it works for one it'll certainly work for everyone. It just seems like putting your effort to getting things work out well but all plans to put that in place is futile cause it may be due to a failure in the planning system or mis preparations and all that. Besides putting your time for something that's not working is a sign that you ought to give up and try out something else.