Your first attempt at anything will be your worst attempt. Whether it's marketing or anything you are trying to accomplish, you will struggle with your first attempt. You need to fail and improve to keep getting better at whatever you are trying to accomplish. The more you work at something and the better you can become at it, the more you will improve over time.
I have failed countless times with websites, my old YouTube channel, social media channels, and more. The reason why I am where I am today is because of those failures, and I'm still learning. I consider my YouTube channel successful, but I believe I have only scratched the surface of my growth. There is a lot I still need to accomplish to keep getting better with YouTube and my online business.
Don't be afraid to fail and quit procrastinating and putting off what you are trying to accomplish. Get started with that website today, get started with the podcast you want to create, or get started with the marketing campaign you are worried about creating and running. Your first attempt will be your worst attempt, but in order to do something 10 times, you have to do it once, in order to do some 100 times you have to get to 10. Keep improving, and don't be afraid to fail.