Is it difficult-yes
will it get easier-yes
will the next licence/rating be difficult-yes
will that get easier-yes
after all if it was easy everyone would do it,
but the difficulty is half the fun, you never stop learning, and if you have stopped learning you must be dead or in another profession.
all the best mate after a few more navex's you will wonder what all the stressing was about, unless of course the instructors doing his job and loading you up a little more with extra challenges