I always recommend A Slob Comes Clean podcast. Her rules are very simple and start by identifying rubbish so it's much, much easier than Kondo and removes all emotion.
No decisions, based on where would I look for this first, it makes it much easier and is specifically for people who struggle with decisions and can't identify what can be got rid of.
So with your boot room you'd start with any visible rubbish. If you don't know if something is rubbish then skip it.
Then durr donations, so anything grown out of or no longer used.
Then you look at each item and ask where would I look for it first, not where should this be.
If you know, take it there now. This avoids multiple piles to deal with later.
If you don't know, ask would I even think to look for this if I needed it? If not, donate or chuck. If you're not sure, ask how much would it cost to replace? Then generally you realise you can chuck or donate anyway.
It is amazing and you can listen while you work on areas. I find she hypnotises me and I end up clearing a shelf or drawer without even noticing.
It also works no matter how long you have, 5 minutes can make a difference so you don't have to make a huge project out if it.
She also has books and downloadable flow charts/checklists if you like that kind of thing.
Good luck with it, its brilliant that you've realised you have a problem and now you just have to find a method that works for you.
[My SIL is an undiagnosed hoarder and you can barely get in the house now. Each room just has a pathway through and 5 adults live there. It's getting worse and so much worse since my brother died, there's no way for me to help. It smells, it's incredibly dirty, they haven't been able to reach or open the front room curtains for years and the whole house is collapsing. I worry about a fire as the stairs are covered in stuff, I don't know how they can all live like that.]
It sounds like you are nowhere near that bad so honestly it is really wonderful that you are trying to sort it out now.