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In addition to the sage advice given by Electronic M, you can also work 'backwards', beginning at the CRT injection point. Bear in mind that some designs inject video via the cathode, others via G1.
Then work back point-by-point to the plate of the vid. out tube (there may be a peaking coil or two in the signal path). Then go to the grid of the vid. out tube, attenuating the genny as needed.
Be aware that phase inversion may occur, i.e., if the display is photonegative, that's normal.
Then to the plate of the 1st vid tube, then to the grid, attenuating as needed. Then point-by-point back to the vid. detector diode, which may be either a tube (e.g., 6AL5) or a SS diode.
The same staging process would apply back thru the IF strip, except you gotta use a moduated carrier, not raw video. Start at the last IF plate, then the grid, attenuating as needed. Then likewise back thru the preceding stages, attenuating as needed, and finally to the plate of the mixer tube in the tuner.
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