Overall, it's quite easy. The air pump itself is located behind the front bumper, driver side corner. It's best if you remove the front bumper, or you can remove the front driver side fender liner (more difficult IMO). Remove the air pump and the large relay attached to it.

There are two hoses leading to the pump, ones hose goes from the air filter neck to the air pump inlet, the other hose goes from the air injection valve (located near the intake manifold and fire wall, it has the hose going into it and a small vacuum hose) to the air pump outlet. These hoses can be removed. It can be a little tricky removing some of the bolts but the process is self explanatory. Be sure to cap off the air filter neck with the supplied vinyl cap (the big one).

Next, you can remove the vacuum solenoid (attached to the rear corner of the air box), its associated vacuum hoses (small diameter), and the reservoir (located below the rear of the air box). The vacuum line do go under the intake manifold and attach to some "solid" lines, all of which can be removed. Be sure to cap off the vacuum hose inlet on the intake manifold with the supplied vinyl cap.

Finally, the current sensor is a black box located under the front driver side fender liner (you have to remove the entire fender liner), in the upper right hand corner. It can be removed too.

See the instructions for pictures of all these parts, which will help when your removing them. As I state in the instructions, you don't need to remove any or all of these parts with the simulator installed. For example, you can choose to leave the current sensor alone, the simulator will still work properly.