I have been hearing a noise coming from the left hand side of the car
similar to the sound of a CV joint going out. I assume that this is
the timing belt slipping. Today, the car suddenly died and wouldn't
restart. The engine would crank, and there was plenty of juice, but
zero compression. The car has 120,000 miles.

I'm assuming that it is the timing belt. If it is, how do I replace
it, which parts do I absolutely need, and how long should it take?

Thanks