rocket surgery

uncountable

Anything overly complex, detailed or confusing.

Japanese Meaning

非常に複雑で、詳細すぎる、または混乱を招くもの

What started as a simple bug fix became rocket surgery once the legacy modules were involved.

単純なバグ修正として始まったものが、レガシーモジュールが絡むとロケット工学並みに複雑になってしまった。

Sense（1）

Anything overly complex, detailed or confusing.

It's not rocket surgery. Just screw in the bulb and flip the switch.