Be willing to work hard.
I find it that if I force myself to make something daily that I am more likely to stay creative. On the days that I feel like not doing anything it helps to force myself to create something...anything at all. Looking at other peoples work and getting inspired, then discouraged and inspired again is a process that seems to occur often. If you don't have the will to push yourself when you simply don't feel like it, then you will never succeed. I challenge you to create something and work towards something you have always wanted to do. BTW don't forget to enjoy it!