The phrase 'how challenging it will be' is correct and can be used in written English.
It is typically used when expressing uncertainty or difficulty in a situation. For example: "We don't yet know how challenging it will be to implement the new software system."
Open Europe's Vincenzo Scarpetta commented that the final outcome is increasingly hard to call: The uncertainty involved in the Italian elections, and the number of parties explicitly campaigning on an anti-austerity ticket, show just how challenging it will be for the eurozone to stick to its cash-for-discipline blueprint, as the hawkish North continues to clash with the austerity-fatigued South".
The public may wonder whether the row highlights how challenging it will be for the government to function efficiently during the referendum campaign.
But the man searching to fill the role of Fanny Brice - Bartlett Sher, the Tony Award-winning director of "South Pacific" - has newly reckoned with how challenging it will be.
The Met Office forecast indicates the global average temperature in 2016 will be 1.14C above pre-industrial temperatures, showing how challenging it will be to meet the 1.5C goal.
But the inclusion of the paragraph about cultural industries that passed Thursday "summarizes how challenging it will be to reconcile the goal of raising growth by breaking down barriers with the tensions and political demands that crop up at the more local level," said Ms. Schaake, who advocates a far-reaching deal between Europe and the United States.
These results highlight how different habitat patches within savanna landscape can have varying responses to grazing removal and illustrate how challenging it will be to use grazing as a management tool to enhance the diversity of native species.
