Buy a Wacom tablet!! There's a series of buttons you can mash together in Illustrator to get some hidden features to display in Illustrator (google how to do this)....anyway one of the hidden features is a click counter. Once i saw how many clicks I was making with the mouse in one day I purchased the Wacom tablet. I was posting 3 to 5 thousand clicks a day, no wonder my fingers were killing!!! anyway....I use hand drawn sketches scanned into the computer, cleaned up in photoshop, live traced in Illustrator, then further tweaking of points using a Wacom Tablet. I Swear by my Wacom tablet. If your going to scan images, try get a hold of an A3 scanner. Drawing an image on A4 paper then blowing it up to A3 size (roughly full men's t-shirt size) is never good, and scanning two half's of an A3 sheet and pasting them together in photoshop is also annoying.