Threads has a short little interview with Kenneth D. King in which he offers great advice to newer sewists:
“If I were to say one thing and only one thing, it’s this: perfectionism is a disease, and a form of fear!
When learning the craft of sewing (which I believe is absolutely necessary in order to know what’s possible when designing), you should expect to destroy several acres of fabric before you get good. This is an acquired skill which can only be perfected by means of repetition—practicing over and over, learning from mistakes, learning when you can save something, and when you need to cut your losses and start over.”
The rest is certainly worth a read over at Threads.