Changing NGUI to 2DToolkit - any shortcuts?

I have inherited rather a large 2D project made entirely with NGUI.

The depth sorting has become flaky with so many objects in there, and considering NGUI is not intended to create an entire game I thought I'd swap the project over to 2D Toolkit before doing any more work on it.

I've upgraded to Unity 4.3 and have the latest version of 2D Toolkit.

I'm wondering if anyone's done this previously and can recommend tips/shortcuts for doing it, before I jump into the donkey work of doing it all object by object, script by script.

Thanks in advance for any answers!