And here's how you do it:
1. First, remove your down pipe.
2. Disconnect the pitch stop from the engine. If you can do this with out removing your intercooler great, I had to take mine off.
3. Take your exhaust manifold off. I would recommend taking the uppipe off at the same time for more clearance, but I don't know if it is necessary, I took mine off anyways.
4. Remove the two nuts that hold the stock engine mounts to the subframe.
5. Get yourself a jack and a piece of scrap wood, and place it under the tranny between the braces. You need to place here because you're going to be jamming you face in the engine area.
6. Jack it up high enough that the studs on the mounts clear. Be careful here. I did this on ramps which probably wasn't real safe. It unloads the weight of the engine from the suspension so it rises for a while before the engine lifts.
7. Undo the front bolts that hold the mount to the engine.
8. Undo the rear bolts. This is where most of the sti guys would just reach around the back of the subframe and get their tools in. But the subframe on the legacy is shaped differently, so you have to go in from the front. So make sure you have the engine jacked up enough to get you ham fist in there.
9. Wiggle the old mounts out.
10. Install the new mounts (hopefully you assembled them ahead of time). They are labeled and only fit one way. Make sure the stud on the bottom lines up with the slot in the subframe.
11. Reverse order of these steps. (tighten bolts to whatever you can, you're not going to get a torque wrench in there.)
here are some less than helpful pictures.