I solve my most difficult problems when I'm not trying. Usually while driving or napping. If I push myself to keep going until I figure it out, I just waste a lot of time and get frustrated. Work hard, take breaks.
The best way for me to crack creative blocks or even programming problems is to take a walk (for an hour or more). My mind will start working much differently than if I stared at the screen or even sat at home. Make sure to carry something to take notes though in case you get too wild with thoughts.
