I’d get the deal i posted in previous comment(above),and buy an SSD. Theres this integral SSD 128GB deal for about £24,put it in,it makes a better machine
There is a video on how disassemble it on you tube and it does not seem like something I would choose to do unless necessary - it easier to attach another hard drive via USB. If you do want to replace you can either buy a larger NVME type ssd (check the manual if it is nvme or sata as the slot is the same for both and some laptops will only take one or the other). It has 12 screws which need tobe removed then removing the case, requires patience. You will likely mark the back trying to prise it apart. You can see a slot for an NVME type SSD on the right hand side (although it may be sata). Then there is a normal sata type hard drive connector on the bottom left hand side, to the left of the battery. The heat pipes will be covered with some tape - dont remove that, although it appears to have been removed in this image so you can see the innards.
Is it easy to upgrade the hard drive on this acer ???
I am a student