Remove the oil filter to access the bottom right bolt with the closed end wrench.
Unplug the IACV/AAC plug. Then lean across the intake mani from the drivers side
to access the bottom right bolt.
If you have A/C & power steering, also move the antifreeze over bottle to the fan area and reach under the AC/PS lines to access the bottom right bolt..
BTW, Ive removed both IACV and Air Regulator. I think the temp sensor is much worse. But, all three are a royal PITA.. Also, Lets not forget the great location of the knock sensor too.. That makes 4 problem pieces. I could think of others candidates too: replacing water pump, egr pipe alignment w/header, etc...