A common thread through all successful men is that they are doers and not wishers. If you're a doer, then something worth doing may take time, but it eventually gets done. If you're a wisher, then you waste all your time wishing. With everything art related, it's the same principle. You can't wish your way to a great painting; you must put pencil to paper and brush to canvas eventually. I'm making a distinction between 'wishing' and 'thinking' here. I spend a lot of time thinking, which can border on wishing, but thinking is absolutely necessary to doing. In a pinch, doing always trumps thinking.
I'm really pushing myself to stop all my wishing and excuses. Think of all the wishing you do and see if you can cut it out by taking action.
One helpful technique is to make a list of all the wishes that you have and realize that they're completely within your control:
"I wish I could draw everyday." -Why can't you?
"Well, because I don't have time." -Why don't you have time?
"Because I work all day." -What about at night or on weekends?
"I'm really tired on the weekends and at night." -Go to bed early on Saturday and then draw on Sunday.
"Well...I usually go out Saturday night." -Screw you.