The instructions are minimal and could be better, but if you aren't comfortable with circuit diagrams, you should probably get a buddly to help anyway.
Just know that there are two SPDT relays that momentarily energize when you respectively hit lock or unlock. In most cases you will either 1) connect two wires from each relay in parallel to existing switches (if you have power locks already), or 2) will add an actuator and connect all 6 relay wires so that it can energize the actuator in either direction appropriately (if you only have manual locks now).
WARNING, do not blindly follow someone else's specific connections (e.g. as mentioned in a review), as some are clearly wrong, while others may simply not apply to your vehicle.