Noel, I've had pretty good luck working on the car's wiring, but there shouldn't be any wiring involved here.
In theory, it's pretty much plug and play. The Hella lamps are the same shape as a sealed beam headlight (sort of) and snap into the same place in the headlight bucket. They, in turn, hold H4 bulbs. The new bulbs and new reflector are supposed to focus the light a whole lot better than sealed beams.
What could possibly go wrong?