All three are designed to be fitted at home in seconds, and we have full tutorial videos on our YouTube channel.
For the camera inserts: take your phone out of the case, pull down firmly on the top of the fitted camera bump and it will click straight out. Then line up your new insert, align the bottom edge first, and press firmly around the edges one by one until it snaps flat.
For the buttons: take your phone out of the case, place the tool provided on the outside of the button and push firmly through to the inside to release it. Then, working from the inside of the case, push your new button outwards with the tool until you hear it click into place. Repeat for the rest.