A handy little phrase that swings two ways. Have a go means give it a try, have a crack, no big speech. Have a go at someone is the other vibe: you’re having a pop, telling them off, or accusing them of chatting utter rubbish. Same words, totally different energy, so listen for the tone before you bite back.
"Never thrown a dart in my life. Have a go, mate. Ten minutes later I’ve smashed a lamp, the barmaid’s fuming, and I’m blaming the oche."