Have one of these and have replaced the front (touch) screen twice. Replaced once with a 3rd party screen, then dropped it again. Replaced again with the genuine HUAWEI part - so SO much better.
Used parts from Ebay and videos from YT; and I am no expert at all.
Having dismantled this thing twice: AFAIR the back light is in with the LCD/TFT/? rather than the touchscreen which perhaps makes it more tricky.