Early days.
Following on from the comments regarding training for techies, as one of the ground crew who saw in the first frame to Thorney Island in '67 the first A/F was completed with the flight servicing schedule in the left hand and a glossary in the right as we tried to decipher the American English and technical terms. All we knew was that the Lockheed rep said the Flt servicing started at the crew door and went clockwise round the aircraft! In the usual time honoured way I had worked on the Herc for nearly a year before getting on the ground school.
And doing the first prop change purely by the book produced some memorable moments, some of which we had rather that we didn't remember. Having come onto the Herc from the mighty Beverly it was just a little bit of a culture shock!