Trying to get something perfect from the outset can often prevent something getting started. For some people when it comes to speaking English they often feel afraid of making mistakes and believe they have to get everything 100% right. To improve your English fluency 80% is OK. Make mistakes, practice, correct, adjust and you will greatly improve your fluency.
So, just speak! Just write! Just do it! And then fix it later. You will achieve a lot more in a shorter period of time.