What actually happens in counselling?

[RestEasy]

DH died this year, I'm doing 'OK' but I know there's lots of stuff I'm ignoring by keeping busy and I suspect I'll crash and burn before long.

If I were to seek some counselling, what actually happens?

I attended counselling 6 months after my dd died. Before that, I was in denial about her death.
Honestly the first couple of sessions I hated it and didn't want to go back. My counsellor encouraged me to talk about her (my dd was murdered).
I did find it hard and upsetting BUT it did help because I could say things to her I couldn't say to my family. We went at my pace if I didn't want to talk we chatted about other things. I had Dd2, 2 months after Dd1 died so sometimes we spoke about the baby.
I attended for just over a year. In the end, she felt like a friend I was very comfortable with her.
Counselling did help my move on and I wouldn't hesitate to have more.
It was a Private counseller recommended to me.

Good luck @RestEasy it's still early days for you. Hopefully bereavement counselling helps you.