Don't worry to much about the explainations, the circuit diagram is all you really need to follow. The circuit on the left (Vorher) is simply what your original battery looks like and the one on the right (nachher) is what you change it to. The LM317 voltage regulators are very common (pretty sure jaycar stocks them). The rest of the pic's should get you by. I got my battery through ebay, you can buy 2 batteries for under $20 (includes postage), that way you get a spare for your camera as well as one to modify.