Get someone to help you hold the chick still until you get the hang of it. I can easily wing band a chick by myself but I was nervous my first few times too. After you get past the first few you'll feel more confident about it. With older chickens closer to mature age, definitely have someone help you hold the bird as they put up more of a fight than chicks do.
A tip with wing banding chicks I can offer is to lightly wet the down of the area around the wing web you are going to band. It helps to be able to see the skin better. Find a good youtube video and watch it a few times. Know the anatomy of the wing and be conscious of the tendon in the wing web. Also dont go too far back because you can sever a nerve or a blood vessel. You will be able to see and feel the thin skin of the wing web where you push the band through. Good luck! You'll do great!