"found difficult" is a correct and usable phrase in written English.
You can use it when describing a task that was challenging to complete. For example: "I found the calculus equation difficult to solve."
I found difficult situations more tolerable".
"Some things I found difficult to accept.
He was detached from thinking about things he found difficult.
The first day of shooting I found difficult.
One thing we found difficult in this part of the design was the ADC conversion.
You should also review the solutions to any problems you found difficult in that unit.
There were quite a few parts that I found difficult to watch.
His face was mottled with an emotion that Briggs found difficult to fathom.
Because acting was a therapy of sorts, Rampling played the parts she found difficult, complicated.
Cross-dressing and transgender – this is something they found difficult to accept.
So if the cobbles themselves were the "easy part", was there anything he found difficult?
