I agree that practicing how to respond to triggers is really important.

During the times when you are not triggered, study the ideas of how to ground make the most sense to you or are the easiest "go to's" to help you through it.

The more you can train yourself to remember those things, the better it will be to bring them up when you are in a triggering moment.

Again, not always easy to do, but definitely worth the effort. As with any new concept, practice practice practice!