I want to use my friend’s dictionary.
I'm not good with pain, so please use anesthetics.
Don’t be afraid of that. You should use the Japanese you know as much as possible.
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means use so the verb version is to use.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
Mr. Tsukalos (つか), the famous Ancient Alien theorist, is always trying to use "aliens" to explain everything. Go read more about him to help you with this mnemonic.