I have only had sushi a few times. I am finding the rolls challenging to navigate - whether using chopsticks, a fork, or fingers, when I bite into a piece the whole thing comes apart and I get the entire piece of fish in the first bite. Is one supposed to put the entire piece into the mouth in one bite? I'm a large person but that's an uncomfortably big mouthful.
If the piece is supposed to be bitten in two, should that be crosswise (as though the roll had been sliced into more, narrower pieces, or lengthwise (like halving a vanilla bean)?