Something that is difficult or impossible to locate.
camel through the eye of a needle
Hyperbole to illustrate something that is impossible to do or to make …
peg the needle
To achieve the maximum level of something, to max out, to pull out all…
heavy going
Something that is boring; difficult to make progress on, or tedious
in the thick of
In the middle of (something difficult).
pull off
To achieve, accomplish, succeed at (something difficult).
set the Thames on fire
To achieve something amazing but to a nearly-impossible degree; to do …