The main thing is you will interrupt the startup if you change gears before hearing the startup music. Once you hear the music, you are good to go, no need to wait for it to finish. If you forgot to put your foot on the brake (or fail to wait for music), the music will not play but the dash looks normal except for a key icon. You could turn it off and then repeat, but it is not necessary. Just put your foot on the brake (return to gearshift to Park if not there) and press Start again.
2018 Kia LX HEV Metal Stream with Advanced Tech