for some people it is cuz they have no clue where to start or cant read a scamatic. But I was in the trade for Engine Perforemance, Engine Repair, Suspension and Steering, Brakes, & Electrical/Electronic Systems. Wiring for me for most cars is simple, German cars can get pretty confusing sometimes since wires alot of times look alike. Honda's are one of the easiest for me to do, its pretty simple.