I get this question a lot. Along with questions about which project is easiest. I'm happy to share the answers with you! =)
If sculpting these fairies something you are very interested in, I'd say definitely. Especially if it is something that calls to you.
I had NO IDEA I could sculpt, and in the beginning, I did not sculpt WELL! I've made my share of alien-looking fairies and babies, and that part was not as joyful!
I really had no sculpting skills in the beginning and watched videos/taught myself. I was pretty determined and persistent, and I'm sure that played a part. But having proper instruction really helps. I like to think being such a beginner myself turned me into a good teacher because I remember what it was like to not know what I was doing.
Do be patient with yourself and keep seeing yourself as able to do it. You'd be surprised how much your positive attitude plays a part in the learning process.
Welcome to sculpting! It's a wonderful way to create! Pretty soon you may have your own gallery of fantasy figures YOU have created!