Let's face it, no matter what you do you always learn something that would have made what you did better if you had known something before you did it. Really, you finish a project and then bam, you suddenly learn a new trick. No I'm not talking about taxes there is no hope there.
A lot of what I'm doing has been a learn as I go since I started writing. The book covers and then the book trailers and other videos. I put a lot of hard work into those and yes I did learn a lot as I went. Now however I've learned some really good stuff that I wish I had known when I started.
Yes I could learn to wait and try to find out everything I can before taking on a new project but when you don't know that you need and what's out there you kind of left hanging until someone comes along and introduces you to it.
I at least know that with every new project I take on I will learn more and more.
Have a look.