Depending on the installation you will need to mount the controller on a metal surface or where it can get good airflow. It is splash resistant, but not waterproof so keep that in mind. You will need to reach the knobs while driving to tune the controller, but you do not necessarily need easy access to them. Some have mounted the controller behind the passengers seat away from the splash zone. You may also consider mounting it on the inside of a steel ammo box that has a removable lid.
Wiring is fairly straight forward.
There's a 12 pin connector on the back and also a 6 pin MAP connector if you have the turbo model. In short you run wires to the ignition, start switch, injectors, TPS sensor, coil, fuel pump, and map sensor. The diagram below shows the basic layout. Take your time with the wiring and double check pin-out prior to reconnecting the battery and hitting the ignition. The safest way will probably be to let the computer control the fuel pump.