Haynes rates this 3 wrenches out of 5 "Fairly Difficult, suitable for competant DIY mechanic". I would say that is correct. It would probably take me about 4 hours as was stated. A pro would be much faster but they still get to charge the full time. You just have to take your time. There are several steps. You have to remove the pully and the hoses. You have to clean off the old gasket and use a new one or some form-a-gasket. You have to keep the different screws in order. You have to tighten all the screws properly and reattach the pulley and reinstall the belt and coolant. Yeah it will take a while. For the record I haven't done it on this car. But it looks basically the same as others I have done.

Good luck!

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra