It seems to me that some emphasis could be added to this step. I had successfully upgraded my HDD to SDD, and I had confirmed the success of the upgrade by booting my iMac 5G 27 2017 to the Apple prompt. In this step 19, I did not use a sufficient, nor a strong enough masking tape to hold my monitor when I was attempting to remove the backing from the bottom adhesive strips in Step 23. When the tape let go, the monitor screen dropped, and unfortunately I still had the power and data cables connected. In the process the data cable and the power cable receptacle were damaged. I hope to recover by purchasing a new data cable. the power receptacle is still usable, perhaps with an adhesive tape piece over the connection. I found this procedure difficult.