Just reaching the last four will be an uphilltask.
The Sun (2008)
The QPR manager was still angry that his team had given themselves such an uphilltask.
Times, Sunday Times (2012)
It will be an uphilltask, but at least we are in with a shout.
Times, Sunday Times (2011)
Seegrim task
Definition of 'uphill'
uphill
(ʌphɪl)Explore 'uphill' in the dictionary
adjective [ADJECTIVE noun]
If you refer to something as an uphill struggle or an uphill battle, you mean that it requires a great deal of effort and determination, but it should be possible to achieve it.