Tipping is always angst for women. We have trouble putting a monetary amount on a service and worry about under or over doing it. Before you travel, check what is included or not included in your tour package. Usually guides and drivers gratuities are extra. Usually porterage is included.
So how do you handle it when the luggage porter stands outside your hotel door , heavy bags in hand waiting for the second tip?
I give in, dig deeply and tip again usually a dollar if in a non European area! What do you out there do?