@Rukbat Thank you for your reply. The instructions do seem simple but I am really, really bad with these things and I know that from previous experience and a lot of failed attempts and money wasted, and it's quite expensive so I don't want to waste it. Would you happen to know how much CW charges for a protector installation? I'll check and see if they have any in stock, but I believe they do have ZAGG Invisible Shield which I used in the past on old iPhones so I am hoping it is still made of good quality because it costs 30 pounds.
EDIT: I contacted CW through Facebook and they told me that they don't actually do protector installations, however they can only sell me the item and I can check a video on YouTube on how to do it myself - how helpful of them! lol
I think I'll try and get it done today while I am still in Cairo before I go back there, however it'll most likely be some kind of Chinese protector instead of a reputable brand.