Ok I swear I posted an answer last night LOL but it's gone missing.
The gel kit doesn't cause any damage as long as you remove them properly and the kit comes with the removal packets so if you just follow those directions, you'll be all set.
It's like wraps in a way that there is a slight learning curve but it is super easy to apply. you just want to try your best to keep it ont he nail and not onto the cuticle or you won't get a good seal and it won't last as long and apply thin coats. Too thick and it will be gummy. But all you do is apply base coat, cure under the light for 45 seconds, apply color, cure, another layer of color if you'd like, cure, top coat and cure and you're good to go. You can also use it over wraps and polishes!
The half off is my code so I can save it for you as long as you like
Here are a couple videos to help you get an idea of how it works.
Application video
http://youtu.be/61kUb1F7TyE
Removal process
https://youtu.be/YqSMjTq0_7I