I spent my time being on the dumb end of a wire wrap tool. It was brain numbingly boring.
When I hired on at AT&T I started with mostly running jumpers, usually a soldered connection for wire strings of 2 to 5 wires each, often running 100+ feet on a jumper frame. When getting more into the computerized operations wire wrapping was a lot more common. With AT&T Long Lines it was mostly long distance stuff, though we interfaced a lot with the "Associated Companies" and with WECO folks.
After a few months I got more into other tasks (mostly maintenance stuff), such as cleaning relay contacts, cleaning and lubricating small motors, then into troubleshooting. After about 3 months I went to a basic electronics course, then a more advanced electronics school (including 2nd class radio license) after another 6 months (though I'd already had it in the Air Force). Later there were other company training schools (one was 13 weeks long), as well- most equipment was unique to the Bell System, or at least to the telephone business.
It seems we had WECO installers in the central offices just about all the time, and I don't know the specific paths those guys took in career and training, but many were very sharp on the equipment, and I know that they, too, had company schools for the various tasks they did.
After 33 years in AT&T I'd been into the later analog computers (analog switching machines, relays and such), then into the early digital computers (DEC PDPs, for example), even into computerized equipment added to the old electro-mechanical machines, then later still into tech support for the growing number of computers (excuse me, "Stored Program Control" machines - we couldn't call them computers) throughout the network.
Interesting stuff, as the years went by.