It is easy... electrons flow... easy... electrical/electronics... meh... some's easy, some's hard. I'm pretty handy but I'm not jumping to I try to wire my own grow box, something I contemplated due to local regs: all grow equipment must be plugged into the wall/outlet directly, i.e.: no extension chords or other devices. Except I don't have enough outlets close together for that, and I like to use tiimers and temp regulators... but that's a whole lot of power to mess about with.
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The regs are meant to stop fires... I think they cause more as people try to wire their own high powered systems to conform... also because things like HIDs and idiots shouldn't mix.