If pax asked I always tell them I newbie.
1st week driving. So if I daydream and forget to turn they will
remind me. Also chances of 'keep the change' is almost 100%.
Yes. It's advisable to make known so that pax will be more
tolerant.
It is always a good thing to receive tipping whether as a form
of encouragement, sympathy , for your honesty or your service.