scratch one's own itch

To do something out of motivation to solve a personal problem; to take matters into one's own hands.

Japanese Meaning

自分自身が抱える問題や不満を解決するために、自ら行動を起こすこと / 自分の必要性に基づいて、手を打って問題を解決しようとする行動

One can scratch one's own itch by writing a small utility that addresses a recurring annoyance.

繰り返し直面する不便を解消する小さなユーティリティを作ることで、人は自分自身の問題を解決できる。

Sense（1）

To do something out of motivation to solve a personal problem; to take matters into one's own hands.

Every good work of software starts by scratching a developer's personal itch.

scratches one's own itch

（ present singular third-person ）

scratching one's own itch

（ participle present ）

scratched one's own itch

（ participle past ）

scratched one's own itch

（ past ）