Just be careful to store the 2 shorter screws in a seperate space then the other 3mm screws.
The first time I opened up my Macbook, I put the screws in the wrong order.
Worst case you could accidentally tear it off
(thank god, that didn’t happen to me, but belive me —> it was a close call)
What I did to separate the different screws, is to take the top of the ifixit essentials-kit (which has lots of small spaces to hold screws) and picked a row of these spaces, which I marked for the cooling-fan screws. So basically I just sort them by lenth: The 5 mm on the top space, underneath it the 4,4mm, and at last the 3,9mm. That way I didn’t loose track, because I was working in tandem with this instruction.