Hi, I would not attempt change the plugs on my 2003 Forester, which is gone now; plugs were just too inaccessible for my 70+ body. But when I recently changed the plugs on my 2003 Honda - at 104,000 miles -- it was a snap. I had to buy some of the things I needed - a new spark plug socket, a simple gap guage, and dielectric grease. I already had a long extension for my 3/4" ratchet wrench, and I was lucky enough to have a neighbor who let me use his torque wrench to tighten plugs to spec.We bought a 09 Forester about 8 months ago and have been very happy with this one. We had had a 1999 Forester before until it was killed in a accident and I still miss that car. We discovered that the previous owner made some strange mods. According to the VIN it's a L.L Bean model. No L.L Bean plaque on the back. They switched the preva (sp) from the right to the left side. They also didn't keep up with the recall repairs. I'm looking to get the plugs changed because power does seem to be a bit low. I googled doing it but can't do it myself like in the old forester but local garages are wanting $300 + to do it. They say it's mostly because the proper spark plugs are $35- $45 each and they have to take the engine out. Is any of this true or are they blowing smoke. I checked and the OEM plugs from the manual are about $5.00.
The whole business, including plugs, and tools cost a little over $50 -- and I'm good for another 100,000 miles.