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Having just done this last weekend, you don't need fire. You don't even need to remove the subframe. Here is how we did it at a mechanic's shop:
1. Unbolt stuff until you can lower two of the subframe bushings clear of the bolts. You need to disconnect stuff but it will not affect your alignment. I believe it was just the coilover, and one l-shaped piece of metal as well as the subframe. I don't remember all the specifict but I do remember that we didn't have to drop the driveshaft or disconnect any control arms (so no need for a new alignment). The driver side we had to drop the back half of the exhaust. One thing to watch out for is that you don't push down too hard on the subframe because you dont' want to snap your brake lines, 2 inches past the bolt should be plenty of room anyway.
2. Once you are clear of the bolt, use a sharp object to pierce the center rubber portion.
3. Use a wood bit on the sawzall to cut out most of the rubber center.
4. Put on a metal bit and cut through both metal cylinders of the subframe bushing, careful as to not cut the subframe ring of course. Three cuts should do it.
5. Run an air chisel up the cuts and the bushing should fall right out as soon as you release tension.
6. Clean out the subframe ring with a course than a fine wire brush
7. If you have poly bushings, which you probably should get (personal opinion though only) they should just slide in. I used PowerFlex Street polyurethane bushings and they slid right in without any lube or anything.
Obviously for this method you need access to a lift or a way to get the rear end up high enough for sawzall clearance and an air chisel. We used an 18v dewalt sawzall so you don't need anything incredibly fancy. The entire job took about 3 hours, but that's because it took until the second bushing to figure out the best way to do it (the first bushing took like 1.5 hours lol).
Edit: This is on an S14 subframe, I don't think the S13 is too different.
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