Probably the safest way to practice is to do interviewing at your current company. There's a lot of similar skills that you need to get good at to be good at interviewing others, and if you work at a good company, they'll want to train you and give you feedback on becoming good at interviewing others. You'll also get a much stronger understanding of what interviewers look for, how they evaluate, what a good interview looks like. So, once you're interviewing for a job yourself, you'll know how to recreate that same feeling.