its exciting and a bit nerve racking to start with but
tolerable.
View page
It's probably been exciting/nerve racking
View page
The adjective is spelled "nerve-wracking" (but also seen as nerve-racking).
It is either from the variant wrack meaning to wreck, or rack as in the torture rack, which is seen in the idiom to rack one's brain (to stretch or exert).
View page
A synonym for extremely difficult question can be exceptionally
tricky problem requiring an answer.
View page
nothing would happen but it would be quite nerve racking