In the past, all Nokia cameraphones used to have an option to turn on or off the camera shutter sound. But recently, they seem to have removed that option because of misuse of cameraphones in some places and privacy issues.
One way of turning the camera shutter sound off is by hacking into the firmware files and modifying the code. But why get into all that hassle when it can be done from a simple freeware?
When doing a tutorial, what do you think will be more helpful, simple text or a video tutorial? Ofcourse, video tutorial will be a better choice as it can deliver instructions better than text.
For creating screen recordings, you need to find a good screencast application which not always comes free.