A former flyer asked for buddy box assistance, when he was returning to the hobby after a lapse of a few years. I had the cord and a transmitter to match his, so I helped him out.

I took it off and trimmed it, and never released the switch after that. He flew it around conservatively, made a few low passes, and landed it. After refueling, he took it off and flew it, then landed, I never let go of the switch. Next flight, he used his own transmitter, and I stood there, but could have just as well been sipping a soda in the bleachers. He was fine.

Chances are, you'll be fine.
Best wishes,
Dave Olson