I just finished doing the much dreaded timing belt, water pump, hoses, thermostat, & crankshaft and camshaft seals on my 93 Legacy sedan.
This motor is by far the easiest to work on of any car I have owned. Everything came apart easily and reassembly was just as easy. I think most novice back yard mechanics can handle this job with a little patience. If you are like me you will carefully clean and possibly repaint some parts before reassembly which will take as long as the rest of the job. I used gloss black Rustoleum to make my radiator and its mounting brackets look like new.
Be careful to align the marks on the new belt with the ARROWS on the underside of the camshaft pulleys. NOT the grove on the leading edge. This is an easy mistake to make and will cause you to take it apart twice as the engine will not run on all 4 cylinders..
Using springed clothes pins to hold the belt in place while tensioners are adjusted works well. You will need a powerful vise to compress the hydraulic tensioner once removed.
My car's water pump failed at 56K which is apparently highly unusual but forced me into the maintenance.
Great savings (25% off retail and no tax) on OEM Subaru parts can be realized by calling Auburn Subaru in Auburn Washington and asking for Jason. Phone # is 866-528-5282 He is very helpful.
Good luck