How to make a new bra super comfy?

I got these really pretty bras yesterday, they have under wire. I have worn them abit and they're not that comfy, it's bearable but in the heat (I'm in England) it gets kinda uncomfortable. Does sleeping in them overnight help? They are under wired :/ please help x

Washing helps to soften the fabric over time.

Is this your first underwire? If it isn't fitting properly, then the ends of the wires could be poking your ribs or underarms. I'm not sure what you could do about that.

But also, the more you wear underwires, the less you notice. I never notice my underwires, unless the bra is wrong for my body.