Just pause a minute and make sure you are ready. After you've consciously been through this drill a few times, it will become second nature. Set the comms and Navs, including any approach aid to the departure airport in case of emergency. It means Tune, Identify, Monitor, and Select. More than one fatal accident has been caused by making the assumption that the radio was set on the proper frequency.
Professionals make sure.
Even well executed approaches don't turn out right if the wrong frequencies are punched in. Don't trust the tuning dial. Other radios may have warning flags to signal unreliable transmission. You've got to make sure you know what's plugged into what, and where al the switches are. If you are satisfied with your answers, be confident you're making progress in your personal airmanship.