I used to have this problem with using ANY of my craft and art supplies. My husband (after many repetitions) finally convinced me that I was being silly and if I ruined something I could buy more, recycle or just toss the mistakes. I always said I liked having stuff more than using it. Now I have the courage to experiment and "plow ahead" and I am enjoying all my art more and creating some of my best work and I rarely end up with something I don't like. I guess I've finally begun to trust myself. I say just go for it.