All you have to do is begin! You'll learn from each thing you make. I just started 18 months ago. At that point, I had no idea how to do anything. Had to learn how to rotary cut, figure out patterns rulers, etc. I am just now finally getting comfortable reading patterns and learning new techniques.
The best you can do is stay involved with blogs like these where knowledgeable people share what they know. There are so many nice people who are willing to share and help.
Good Luck! You can do it!