Advice to improve my sketching on an Intuos 5

It takes a long to time find the feel of drawing on a tablet, but just keep working on it. Use multiple underlays to go from rough to refined, just as you would with say a marker and pen. Take advantage of everything the table gives you, too. Make liberal use of the touch ring to rotate the canvas. Map one of the keys to the Undo function. It will be much less frustrating to take a few attempts at hitting a line perfectly when all you need for a redo is a quick flip of your thumb. I love drawing on my Intuos 4, and even now it still takes me multiple attempts to hit the angle, arc, or length of a line perfectly. That undo hotkey is clutch.