YES, DO NOT TAKE THIS PART OFF. The reason the guide says to take it off is because in step 30, it might get in the way. If you be a little more careful, the cable coming from the camera won't be a problem. However, if you do take the retainer and the camera off, you should expect your repair to last a couple more hours. I have spent several hours on some repairs trying to put the retainer back on, and then realized that it was 90% useless to do so.