A retail trolley opener kit bolts in the same way regardless of what's written on the box, and if your garage has normal headroom and a door built in the last couple of decades, a careful homeowner can get through that install without calling anyone. Where it goes wrong in Wheaton specifically is the headroom problem above - boxed kits assume a clearance that a lot of 1959-era garages don't have, and the instructions don't tell you what to do when you're three inches short.
The other thing a DIY install misses is matching the opener's force settings to an old torsion spring setup. If the spring was sized for the original door and somebody's swapped panels or added insulation since, the opener can mask a spring that's working too hard - until it snaps a cable. That's not a wiring mistake, it's a judgment call about spring tension that takes a known door weight to make correctly.