I think it's common to get to "that point" in any project where you feel like it's not going to work, or your not happy with it. At "that point", it's hard to move on and see the end result. It's then where belief that sticking with it will pay off in the end and a little encouragement can go a long way.
"When you come to the end of your rope, tie a knot and hang on."
-Franklin D. Roosevelt
"Everything will be okay in the end. If it's not okay, it's not the end."
-Author Unknown
"When you get into a tight place and everything goes against you, till it seems as though you could not hang on a minute longer, never give up then, for that is just the place and time that the tide will turn."
-Harriet Beecher Stowe
"A bend in the road is not the end of the road... unless you fail to make the turn."
-Author Unknown
"When it is dark enough, you can see the stars."
-Ralph Waldo Emerson
No matter what project you are working on, whether it is something at work or a personal goal, remember to push through the hard, discouraging times. You will be so happy in the end that you persevered.
If you are working on any DIY projects, here's an encouraging article for "When Your DIY Seems Doomed".