Shifting A Columbia In A '40

[philipswanson]

I just installed a Columbia but have not driven it yet. I am confused about engaging and disengaging the overdrive. One instruction I read said to lift off the accelerator off the floor and pull the handle. Then push the clutch in to complete the shift.

Is this right? I would have thought that you would push the clutch in first like shifting a transmission gear. Which way is correct? This is a '40 stock installation, not electrical like later Columbias.