That telescoping basin wrench you talk about I have rented from Home Depot in the past. Working that tool is like holding chop sticks from the far end.
Surfer-thanks for the reply. No soldering, just the fitting. It's the long reach that's frustratingly difficult with the tub right-side-up. Yeah, probably going to remove it.
In one instance, for a kitchen sink, I found that a matching size deep socket wrench bit with a long extension bar would do the job better than a basin wrench.