It is hard to mess up the valve train on the MKlll's. The valves are a non- interference type and won't hit each other nor the piston even if the timing belt breaks. At least that was one nice thing Toyota did for us to make up for the crappy job on the stock head gasket/bolts.
Like Foogoo said earlier, it does take patience, but I have done it several times. The main thing is to have enough shims of the proper thickness. There is no telling how the gap was before you removed them, but I think you can get a measurement by just putting them in and using a feeler guage. Just make sure you have a nice sheet of paper to write down the measurements for the gap on each puck and the thickness of the shim. I measured mine with a micrometer in thousandths and wrote them on the shim with a sharpee pen. Since you are going to measure them in thousandths for the gap you may as well measure the shim thickness that way too.
I took the cams out to do mine since I don't have the tool, but get the tool if you don't want to mess with the cam timing and cam retainer caps, which by the way have to go on in order like they are numbered on each cap. Intake and exhaust caps. If you get the gaps in the range mentioned you should be fine.
Good luck and let us know how it goes.
Russ
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