Gagging with my Girlfriend and how to go about it

So recently I as talking with my long distance girlfriend and she said wanted to try gagging when we meet again and I was wondering what was a good way to go about it and if there are any dangers associated with it. I don’t want to hurt her obviously but I do want her to enjoy the experience as much as I will. We are both virgins and we’re going to meet again soon so we’re pretty inexperienced. Thank you!