Hi Myq,
As you've no doubt found already, iFixit doesn't have a guide for the repair you're trying to do. The good news is I found a Spanish site called Nadie Me Llama Gallina that does. Here you go.
[link|https://www.nadiemellamagallina.com/en/manuales/smartphones-1/huawei-50/huawei-nova-5t-1202/pantalla-completa-10678|Manuales / Huawei Nova 5T / Fullscreen|new_window=true]
Replacement screens can be found on most of the major retail sites such as eBay, Amazon and AliExpress, along with many online parts stores. There's a relatively inexpensive one on AliExpress I ran across; most of them cost quite a bit more than this one, but it seems to have gotten reasonably good reviews.
[link|https://www.aliexpress.us/item/3256802451923226.html|Original 6.26'' Display Replacement With Frame For Huawei Nova 5T LCD Touch Screen Digitizer Assembly YAL L21 L61A L61D L71A LCD|new_window=true]
Good luck with your repair; let us know how it goes!