APRIANA,
The first instructor that you mentioned went the extra mile with EXCESSIVE detail, in the certain knowledge that everything would be covered, with an extra buffer for that which you would inevitabely forget. He/she handed you a slab of Cheddar, not a piece of Swiss cheese.
The second good 'ol guy/girl handed you a bleedin' donut.
Now, which one did you learn the most from, and which one made you feel the most confident, and therefore relaxed?
Keep Safe,
Old Smokey