Getting Started

I ordered a 3D Chameleon yesterday for my Ender 3 V2. I am really looking forward to installing it and using it. However before I start the installation I have a couple of questions. Please forgive me if these have already been answered in this forum but I could not find them.

I have seen several mentions in YouTube videos of using the extruder on the 3D Chameleon instead of the extruder that is on the Ender 3. I am looking for instructions on how to do this. Can you share a link? Also I see that the use of 3D Clippy is also recommended, is that necessary or a nice to have? If it is a necessary where can I find details of that?

Thank You