I think of this every time I start a new drawing on canvas. I have the finished painting already in my mind... But I still have to go through the creative process to get there. Holding the vision has to be enough for now.
And just enjoy the process.
Focussing on the present, it becomes more about the journey than the outcome.
It's the same for anything new I'm creating in my life... It's called transitioning the transition and I've written a few tips to help with the process...
PS ~ Find out where You are in Life's Cycle of Creativity... Take the Quiz!