"Uh, hopefully well," is what comes out first, with a little laugh. "I mean. I'm not exactly great at carpentry? I'm using this," and here he brings the level back out, "to see how bad they're off, then trying to, uh. Pry up most of the nails and reposition the thing and nail it back in."

He'd started from the outermost cabinet, figuring once it was straight, it might give him enough room to adjust the ones interior to that. It may or may not be a sound plan, but it's what he's going with.