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It is under throttle body. I don't think it can be removed without removing the throttle body, which does not mean it is "extremeley" hard, but it's definitely more than just 2 bolts.
I would not bother with the IAC valve - it seem to be very reliable and some cleaning is all it might ever need.
TPS (dirt accumulation) and MAF (wiring problems in the sensor, fixable) are the sensors that seem to be going most often. Both are expensive to replace.
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