Great question, and it's smart to be cautious. First, forget about the horror stories you see online – those almost always come from under-qualified people injecting in unsafe environments. A professional will never give you that 'frozen' look unless you specifically ask for it. For your first time, look for a medical doctor or a highly experienced nurse injector. During the consult, they should assess your facial anatomy, not just sell you a deal. They will likely start with a low number of units to see how your muscles react. A good sign is when they ask you to make expressive faces (frown, raise brows) to map out the muscles before they even pick up a needle. Don't go to a place that pushes you to do your whole face at once. Start small.