Here are a few advices from one of our favorite articles written on on Inc

Create for yourself first. And don't aim for perfection.  And do it even if you think others won't like it. That frees you from the desire to please your audience and everyone else who will see your work. You will create  something  original, unique to you and honest enough to share with your audience. Ignore those judgmental voices hissing and whispering over your shoulder.

You don't have to be right when you start any creative project. The only thing that matters is that you show up everyday and just do what matters to you. For every piece of creative product you have seen, there are thousands of false starts and questions. You can only become comfortable and trust your work if you focus on getting it done, launching it and improving it with time. Practice can't make you any worse! It can only make you better. 

See your first creative work as an experiment. Deliberately do things in a way that keep you from thinking about how people will react to it when it's done. Stephen King wrote about writing his first draft with the door closed (metaphorically) and later drafts with it open. You want to bring up whatever's inside you and in a way that encourages it to come out instead of entertaining thoughts that limit what you can do. Give yourself the freedom to create. 

Separate the functions of 'creating' and 'analysing'. Both aspects of the creative process are extremely useful but different.  Don't analyse everything you do as you create. Just concentrate on finishing your first iteration without worrying about the quality or final product. You can always come back to it.

Leonardo da Vinci is believed to have worked on the famous Mona Lisa painting between 1503 and 1517. 'You don't have to be great to start, but you have to start to be great' says Zig Ziglar. The goal is to keep moving forward once you start. Unlike Leonardo, you may have to show your work to get feedback and improve. But where necessary seek feedback to improve as you create. Trying and failing is better than never trying at all.