Rotoscoping images is easy but time-consuming. In the article I used to do this, an animater from A Scanner Darkly said he expects to take 5 hours on a complicated image.
Tutorial: mMm-MHmm
2cents:
Do a few (5 hour) test runs. Try to mimick the style of A Scanner Darkly. That should make you very irritated and more experienced, but will allow for your style to show through the medium. Get the techical stuff of learning out the way quickly so you can start doing your own thing.
