That on a strip of rawl plugs there is a hole for you to put the drilling end of a drill into to find the right size drill bit and 2 holes for the minimum and maximum screw size So you can find a screw between the hole sizes that will fit. Also that if you use the correct drill size it doesn’t matter how deep your hole is because rawl plugs are designed to flare stop them falling into the hole.
No matter how careful you are drilling hole for rawl plugs, your wall is liable to disintegrate if you have an old house so you need filler on hand at all times and some of the metal filler tool things (or a credit card).
HG mould spray and Wickes antifungal wash are great.
Misted double glazing units can be replaced without needed a whole new window and you can get universal window handles online.
Zinsser bin and bullseye 123 as a first coat mean you can paint over most surfaces.