手てこずる

godan verb (-ru), intransitive verb

have a hard time; struggle; be at a loss

Used when something is difficult to deal with or manage, causing trouble or frustration. Often implies being unable to handle a person, task, or situation smoothly.

• 新あたらしいソフトの使つかい方かたに手てこずっている。

  I'm having trouble figuring out how to use the new software.

• 彼かれは頑がん