Break it down! Take it one step at a time. When you look at something (steeking, short rows, cabling, etc) that seems intimidating, break it down one step at a time. Individually the steps will be much easier to tackle. I feel this way about sewing projects all the time, too. If you look at a finished garment like a coat or jacket it always seems like SO MUCH WORK. But really, you sew one seam at a time just like you were making something simple, like a pillowcase. Baby steps, friends.
Know you're not alone. Seriously, it's impossible that you're the only one learning how to do something technique-wise. Google it, YouTube it, visit your local library and check out a reference book. Someone, somewhere, has tackled this before and has more than likely documented it for someone else just like you.
Mistakes encouraged! Don't be afraid to rip it out or start over. It's completely true that practice makes perfect. The more you have to repeat something, the better at it you're going to be. Your first attempt will be less than stellar and THAT'S GOOD. As a total perfectionist, I often have a hard time being ok with making mistakes. But how are you supposed to learn without mistakes? We're not robots pre-programmed with the knowledge we need, and that's a good thing.
What new thing are YOU going to try?