About 2 months ago I replaced the timing belt on my 02 automatic with 114,000 miles. The job took me awhile as it was only the second time I'd ever attempted this. The first time was on a 97 Rav-4 I owned previously. I replaced the belt, water pump, tensioner, thermostat, crank and camshaft seals, and both accessory belts, about $300.00 in parts (also, see below). Once the radiator is out there is really lots of room to work. There are several good information sources on the proper steps of doing the job on here and the internet. But definitely have the info printed out for reference. You don't want to ***k this up. It's an interference engine and you could cause serious/expensive engine damage.
I wanted to pass along some tips. Buy the parts from Subaru. It's a few bucks more but worth the reassurance you have quality parts. Trust me on this. The new timing belt is marked to help you align it during installation. Remove the spark plugs to help make it easier to keep both the left and right side of the engine aligned as you try to install the belt, and also after you do the install you can rotate the engine by hand to check the marks. Protect the AC radiator core with a piece of cardboard. Take your time. You rush through this and it will cost you several thousand dollars. Watch the drivers side camshaft as it has a tendency to want to rotate when the engine's at top-dead-center on piston 1. You don't want that. The physically hardest part of the job is removing the crankshaft pulley. I saw a tip about wrapping and old piece of drive belt around the pulley and grabbing it with my chain vice grips. It worked great. (see my photos). I've also heard about putting a breaker bar and socket on it, brace it against the floor and bump the ignition. This scared me to death. I could just imagine the bar rotating around and beating the s**t out of motor and engine compartment, or wrecking the crankshaft pulley nut. Then try to get that off. It's not rocket science but be careful, get good instructions, and take your time. Do it right the first time.
Hope this helps. Email me if you have any questions and check out my recent thread about replacing the front axles.
Got something new to add since I did this. This car now has almost 175,000 miles on it - not bad, but it has developed a slow oil leak from under the engine compartment somewhere. It loses about 1 quart or less over 5,000 miles. I took it to Sport Subaru in Orlando about 6 months ago to get a front wheel bearing replaced, and while it was on the lift I asked the lead mechanic about the leak. He told me there is an o-ring behind the oil pump and when I changed all the timing belt gack out I should have replaced that as well. I'm going for 200,000 but will not tear this thing apart again to replace a $4.00 seal because I'm losing $3.00 worth of oil every 4 months. Just wanted to let you know, this is something else to replace.