hard nut to crack
tough nut to crack
Fort Knox
pinch
tough sledding
bring off
hot ticket
dig a hole for oneself
nasty
bog
behind the eight-ball
come at
un-come-at-able
un-get-at-able
sneak in
ungetatable
gold is where you find it
bay
pass
hardpressed
get in
where the shoe pinches
fish in troubled waters
stumblingblock
up a gum tree
bunker
scrabbly
amotivational
extort
difficulty
wring from
enmesh
mire
encroachment
Catch-22
break and enter
torfer
mispursuit
doo-doo
push shit uphill
opportunityless
stay
catch
morass
roadblock
frustration
hard-set
defeat
run for one's money
unselectability
barrier
opportuneless
hard put
hardness
do it tough
lost
difficultate
confused
swamp
ruggedness
carpetbaggery
disoriented
underprivilege
come by
Hollywooding
wilderness
elusiveness
let-out
eke out
unattainment
daunting
disqualification
portal
diff
maneuver
difficultness
hit
arrive
Matterhorn
catch a cold
out of the frying pan, into the fire
underwater
spoil the ship for a ha'p'orth of tar
hard sledding
over the river and through the woods
slant
blunt
difficulty level
sticky
dismay
above water
pig
trance
discouragement
direct
disheartenment
unreachable
desperateness
unnavigable