Botulinum toxin injections are quick and relatively painless. Some practitioners will use ice or lidocaine to numb the area before injecting and most people say they just feel a little 'prick' when the product is injected into their skin.
Treatment is quick; you'll be done in less than an hour.
When applied correctly, you will still be able to smile and display most normal facial expressions like wrinkling your nose up; just with less severe wrinkles.
The best part about getting Botox is that it is well-tolerated by most people.