is there an idiomatic expression to say something went fine, something happened without any trouble and with ease

It was a breeze.

"Smooth sailing" is the first one that comes to mind for me.

> It was a piece of cake. (It was easy.) > It was smooth sailing. (It was easy, problem-free, and without negative consequences.) > It went off without a hitch. (Of something planned, no problems were encountered while doing it.)

You can say it went smoothly.

That was smooth - like butter. It went off without a hitch. Easy peasy lemon squeezy.

Like clockwork. https://idioms.thefreedictionary.com/like+clockwork

Not a problem Easy as pie (doesn’t make sense but you can hear some speakers say this in different regions) Like a breeze

my favourite (slightly rude) is the british 'piece of piss'.