I let a friend drive my car to the gas station and he done fucked up my car. At first it seemed like he burned the clutch out, but every day since the night I let him drive the car, the pressure when applying the clutch decreases.

Everytime I start the car up, I have to "pump" the clutch to get some pressure. So with this, I know that something must be leaking. My guess is the master cylynder for the clutch is leaking. Any other possibilites?

If it is just the clutch master cylinder, is it a possible DIY job for a weekend?