With the bottom cover removed the hard drive and RAM are easily accessible.

The hard drive is held in only by friction,

To remove the hard drive from its mount lift the drive a bit from the end near the data and power cables

Disconnect the power and data cables, the cable is a delicate ribbon cable so be gentle, don't pull it out or the way too far.

Lift the cable end a bit more and slide the drive towards the ram a bit to release the clips holding down the other end.

the mounting frame can just be pulled free from the drive, it is also only attached by friction.