Good luck with your career, but remember that as a JEngO, you most certainly are NOT
[I'm] going to be responsible for fixing your aircraft.
That's what the techies do.
You are responsible for ensuring that it is done in a safe and timely manner and in accordance with all the relevant JAPs etc.
As a long sufferer of some of the best and worst JEngOs around, my advice would be:
1. Make sure you get to know the people you command.
2. Always trust the Chiefs (for about 95% of the time)
3. If you ask "what is wrong", be prepared to listen to the answer.
4. Don't be afraid of visiting the techies at the coal face, see the problems first hand. Maybe even offer to help out and see how each task is done, and how long it takes, and why. This will help you estimate aircraft 'down time'.
5. If in doubt ASK, there are silly questions, and people may laugh, but you will get the answer you want, and people do respect those that ask, but if you waffle and bluster your way along, respect is quickly lost.
6. Act as a buffer between SEngo and the troops (Both ways).
7. Enjoy.