How to replace a lcd

Step by step iFixit-style written guides for Tecno phones appear to be a bit hard to come by, but there are a few YouTube videos out there that show the process. Out of the several I viewed, this one seemed to be the most complete and accurate.

TECNO CAMON 40 Basic Teardown DISSASEMBLING - INSTALL AMOLED NEW LCD #tecnocamon40 - YouTube

After watching the full video, I do have to note that the removal process shows them taking out the battery, but given the location of the display connector, I don't see any reason to do that, so I'm fairly sure you can skip that step when disassembling it. They also gloss over the reassembly procedure, but it basically consists of following the removal guide in reverse, which I admit is more than a little clumsy when viewing a video.

You can certainly take the time to view more videos, but most of them were either just overviews or fast forwards through the process, making it impossible to follow. Feel free to ask questions if there are parts of it you don't understand or need clarification on; we'll be glad to help.