Hi,
my technical interview was pretty straightforward. It was done on Skype with power point. The bloke doing the interview asked me about what I did and put me at ease,then we started. The format was he would show me pictures of things (starter motor etc etc) and ask me about them.
I made sure I answered with as much technical information as possible and incorporated health and safety, Engineering hygiene etc etc into as many answers as possible.
All in all it took about an hour and three quarters.
Sure you you will be fine, as long as you know the basics and can explain how things work and workshop practices.
good luck.