true the videos imply speed and ease they still show true how to do it,, hence slow dont panic... it the black slide was no where like the video ease but again not difficult the alloy cover can be tight but like i said i use guitar pick 0.3mm steel one and it just slides and eases it open..
the rest is in the video about glued on battery which pretty much lifts of itself with small pressure.. i recently done one with a broken mash screen and even then the cables all stayed intact which i thought would be broken so it didnt need digitizer
watch the video and watch it again its no more difficult than a lot of jobs to do, but it depends i guess on your skills like all things in life i know chefs who cant make decent bread or yorkshire puds... and there easy..lol