Question everything bearings, when they ask you do you understand don't just stare at the instructor blankly, let him know if you don't get it even if you appear to be the only one not to get it I can assure you, you wont be. Enjoy it but you are there to learn and as long as you put as much effort in to this as you do your working day you will be fine. A wee tip I always ask the boys before sending them off is come back and teach me something, usually gets them thinking, don't think it's worked yet but it's always worth a try. Good luck.