I agree with the others - good light, good dust removal, and good blades are huge helps. It's tempting to feed the stock too quickly, which both stresses and deflects the blade, resulting in loss of control.
The driving analogy is also close - that is, looking at where you'll be going, rather than where you already are. That will allow you to anticipate the "turns" and adjust "steering" accordingly.
The wrinkle with scrolling, and where the driving analogy starts to lose traction (pun intended, of course), is that the center of the radius, the point around which the stock needs to rotate, is often changing as you pass through a curve. Or, it's simply difficult to estimate where that point is on the stock. One approach that can help with that when marking out the pattern on the stock is to also mark the center points of curves that are actually part of a circle. The center mark will give you a visual reference point around which you can then rotate the stock.