I would stick to two basic principles: get the primaries right first, and rely on the scopes.
Scrub through the footage and pick a reference point to match everything to. Probably either the beginning or the middle. Try correcting 3 select shots from the beginning, middle, and end of the interview until you find an acceptable medium of color temperature, gamma, noise levels etc.
A good workflow for grading is always to get the shadow right (base exposure level), then the highlights (gain), then the mids (gamma) – then color tone, and only then proceed to secondaries. Abiding by this workflow helps maintain consistency when matching multiple shots.
To help match and judge, ‘read’ the scene using the appropriate scopes and replicate where things fall.
That should get you 90% there, 98% if you’re lucky 😉