Are they top or bottom? We were taught not to numb people up on both sides at the bottom as it's an uncomfortable sensation for the patient as their tongue would be completely numb. Some dentists do though.
Otherwise it's totally up to you, might be best to get them over and done with like you say. They're probably only little ones if you've not had any before, the only painful bit should be a slight scratch as you're numbed up. After that you might feel some rumbling from the drills but no pain. xx