To ask you how a professional declutterer works?

Do they do any of the 'getting rid' ?
I've agreed to get rid of various things, but then end up with a pile of "try to sell these" or "need to find a person or a good cause who would be able to use these" etc as my real issue isn't the things leaving my house, but the idea that perfectly useable stuff shouldn't just go in a skip.

What I would pay for (hopefully out of the proceeds!!) is someone who would sell stuff at an auction hose or a car boot even, or on-line on any platform.

By all means get in help if you need it. If you read Marie Kondo she takes you through the process (it's a quick read) and talks about the common problems she encounters with clients. The thing she mentions often is to do it all at once - don't do it in stages.

Yes I’m determined to do some decluttering

I'm a professional declutterer. I think we all use slightly different methods so it's when you contact one you can ask them individually. The way I work is listening to clients needs, ask questions and then suggest working in a way that suits them. Eg, what are their priorities. Which bit of their house bothers them most.
Some clients can only work very slowly, others are ready to chuck loads with put too much issue.
We normally start with a tour of their home so I can get a sense of the main problems and how they feel about it.
I never start with the difficult emotional stuff but always the easier things which will be different for every client. But starting on the easier feels less scary for them, and builds confidence and relief.
I teach as I go too. So that a client has strategies to continue when I am not there.
I think it's a great idea to get someone in. The relief will be enormous and you'll feel great to have reset your home for the summer so you can get on with relaxing.

Also interested. Have you watched Sort Your Life Out? They aim to get rid of 50%.

You need to find your own blocker and just be ruthless. I found what held me up was umming and ahhing over what would happen to the stuff, so in the end I got DH to sort that so i didn't have the guilt. I just did keep or let go piles.

Anything I was unsure of went in a black binliner and I hid it for 2 weeks. Then if i hadn't gone back for it, the bag went in the go pile (DO NOT CHECK IT AGAIN 🤣🫣)

Some stuff you just need to be practical about. How many duvet covers do you need? Two? Three? Pick your favourites and pass on the rest. If you don't have single beds anymore, get rid of single bedding etc.

Following with interest!