Is that the only material you have? I'd suggest you pull something from your stash and do a different/small project. When you say things like "I'm gonna mess it up anyway? guess what: You will because you set your mind up to mess up. It's called a self-fulfilling prophecy. Why don't you change the tone of your self-talk to say: "Come on! I can do this! It's gonna be beautiful and I can be very proud of myself for meeting this challenge."