My raw edit:
"WARNING: motherboard can't be removed without removing the 2 screws holding the fan to the laptop body! That edit for their position (not clear in this shot) was declined. I would have broken something if I kept on pulling with those screws too in place."
I added a new picture showing clearly at least one of the two screws, but positioned the marker also on the other less visible one.
The raw edit for "Before reassembly, make sure your new fan freely rotates within its housing." is necessary to avoid going through all of the steps again. I had to use a screwdriver as a wedge to widen the fan's housing distance from the fan, and blow into it to verify free fan rotation.
Thanks for this helpful guide! But 2 edits were necessary, one in this step to avoid breaking something.
Other than that everything went well. So thanks again!