Water pump and timing belt should be replaced at the same time since the labor is essentially the same. Both need to be replaced at 10 years or 100,000 miles. In my opinion it is not a job for a first timer since it involves removing everything at the front of the engine.
If you want to give it a go, purchase a Subaru service manual available from eBay sellers for around $10. You will then have detailed instructions to decide whether you have the skill and tools to do the job.
105,000 miles
The 2002 Subaru Outback has 16 valves.
The 2002 Subaru Outback has a 5-speed manual.
The 2002 Subaru Outback is a gas-powered vehicle.
The 2002 Subaru Outback has a flat 4 engine.
The height of the 2002 Subaru Outback is 5 ft. 3.3 in. (63.3 in.).
The 2002 Subaru Outback is 15 ft. 7.4 in. (187.4 in.) long.
The 2002 Subaru Outback's turning circle is 36.7 ft..
The 2002 Subaru Outback runs on regular unleaded.
The 2002 Subaru Outback has a drag coefficient of 0.32 Cd.
The curb weight of the 2002 Subaru Outback is 3425 lbs..
The 2002 Subaru Outback has single overhead cam (SOHC).