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I generally put up a crosshatch pattern and jump between the Height, lin and centering till I have a reasonably linear centered-ish picture. Compromise and incremental improvement can be the name of the game if it don't just fall into adjustment.
If the tube is good, generally resistors and caps are next, a check of the B+ and b+ Boost rail voltages feeding the circuit, and last the transformer and yoke.
For HV wire on normal sets I just find a big-screen 90's or newer CRT set at the curb, cut the donor set's HV lead at the fly, and unhook the cup from the CRT....That way I've got the lead and connector together.
Does your set have some kind of HV plug on the flyback end?...If so it could be difficult to properly change the HV lead without causing new problems.
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