Don't be afraid to "fail".
If you look at the photo of where I started at in my cake journey, you'll see that even though I was making cool cookies, I wasn't hitting home runs when I went to decorate cakes. I was learning on my own, watching youtube videos but VERY few people walk you through the step-by-step techniques along with the cues that you should look for when executing the techniques.
Messing up and having "ugly" cakes is a part of the learning process: it takes time and repetition to get good at anything. This course will help ease your learning curve but nothing helps more than practice. Looking forward to seeing what you create!