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Mate as a ex apprentice, apprentice mentor and Apprentice area trainer.
I can tell you not to worry, they dont expect you to know the in's and outs of the job straight away, thats what the training is for.
And for the self conffidence, it should be your mentors/trainers job to build that up with you. They won't just chuck you in the deep end and hope you swim if they are a decent company.
Also your previous history will probably hold you in higher stead than a person straight out of school because you have knowingly chosen this role, instead of wandering into it. Plus experiance is experiance end of the day, you have worked to targets and within teams, which is what they are loooking for.
Anyway now to be a selfish bugger, I have just got a my compex qualification and am now looking at a shed load of new jobs, Its gonna be a pain in the arse altering my c.v. for each one. Anyone got a tips on what areas Oil and Gas are concentrating on when looking at C.V's ??