Don't give up

 You miss all the shots you don't take.

Despite how frustrating it gets to miss, to fail, to get it wrong, it is only a matter of time before you will get the hang of it and will be successful.

Of the things that are needed to be successful, I find that there are three.

There are two of these elements that you control: your method and your willingness to give it another try.
The third one is time.
Try different methods, time and again. Fail, make mistakes, Turn back after and reflect on what you can improve on.

Just don't give up.

Make it a mission to reach your objective. You may not know how you will do it, you may not know when, you may not believe that you're even capable of doing it. Despite this, you must give it a shot and let life demonstrate that you can't do it. 

You can't go into a battle thinking about what you'll say when you lose; you're destined to lose if you do so.

The same way that Mr Miyagi taught us to wax on and wax off, you may not know what you're going to learn from the experience, but you could be molding yourself into a karate kid with each attempt you have.