Hi there ,
You need to use a screwdriver and a nut drive.
First of all, flip the PC over to the bottom , please use pointed tweezers to take out the four small screw rubber covers. Then remove the four screws with a screwdriver. Pull the rubber on the bottom case to open it.
Secondly, remove five screws of the heat fin, put heat fin away, next,remove two screws of the small board, take out the small board, then remove one screw of the heat sink, take out of the heat sink, then remove one hexagonal poles screw with a nut drive , take out the original SSD and install the new SSD. Please separately take out the two RAMs by pressing down on the latches on both sides. Then install the new RAM.
Finally, put everything back in its original place. After all the components are installed ,it will be ready to use.