Life doesn't happen on paved roads. There are no solid lines or straightaways. Only twists, turns and bumps with short pauses in between. The pauses are those flow states. Not everyone gets there. Those are the times when the rattling of your mind stops, and you feel absolutely no resistance. Whatever you're doing seems joyous. Your mind stays out of it.
People who choose to do difficult things are often hardest on themselves. They are their own toughest coach and critic. They are also the main obstacle in their own success.
Recognizing your progress is essential to staying motivated. Growth is not always visible. Most often when it seems to happen in a great leap, it's actually a collection of all the small steps that came before it. Staring at a plant to make it grow faster will only frustrate you. Just think about anything difficult you've ever done and the pleasure you felt when it was done. Long term goals have these same grueling periods that we all have to push through in order to achieve what we want.
Forcing something that is not there, however, will eventually lead to stagnation. Sometimes taking a step back to look at other aspects your life can make your goal easier to achieve. Often, your strategy must change.
Most importantly, once all the pieces are in place, forget about it. Or be so prepared that once you're doing it, you don't have to think. You can't worry about being at a plateau when your mind is no longer needed. The planning is done. Its job is over. Now, you, not your thoughts will get you the rest of the way as long as you stay passionate and clear about your destination. Only through preparation, practice and dedication during the tough times can you learn to let go enough to keep when things get in your way.