Oh, and there is usually more than one way to go about doing something - above Grendel shows a different approach where he models more the cross-section of the thickness of the tub instead.

There is no one "right" way, but basically the area that you are most interested in controlling will guide you to where you want to draw your curves to begin your construction.

But still the basic common approach is to draw some curves to define some key areas of your shape, then surface them.

- Michael