Removing the RAM on the mid 2010 Mac mini is an easy task that requires no tools.
Place your thumbs in the depressions cut into the bottom cover.
Rotate the bottom cover counter-clockwise until the white dot painted on the bottom cover is aligned with the ring inscribed on the outer case.
Tilt the mini enough to allow the bottom cover to fall away from the outer case.
Remove the bottom cover and set it aside.
Release the tabs on each side of the RAM chip by simultaneously pushing each tab away from the RAM.
After the RAM chip has popped up, pull it straight out of its socket.