Hi Fiona -
Just back from hols and catching up. I’m not sure I’d regard replacing a cracked screen as an “entry level” repair. And I don’t have one to demonstrate on. Each smartphone is different so a step by step guide is going to be of limited use. But if the objective is not to show how to do it but rather to show that it might not be a hard as you think and to point readers at iFixit or somewhere similar, I can see it might be useful.
Maybe cleaning a laptop fan might be a more suitable topic. A couple of other people replied and I’d be more than happy for one (or more) of them to tackle this - and maybe even then to recruit them as Wiki authors!
Headshot - not a problem. Top tips and tools - could probably come up with some, and maybe ask for suggestions on Talk.
Kind regards - Philip