@Cailleachbeag assuming your home is of normal family life standard of tidy/untidy, (like mine) then the two things aren't really tackled as one. I clean 1 day a week, like a cleaner does, although it does take several hours while Ds is at nursery. But the decluttering is a separate task, done in addition, and I suppose it's a 'right I'm going to spend 2 hours on Saturday doing this task' sort of thing. I haven't done it for a while and it's brewing. Although I did sort the boy's wardrobes and put the outgrown things in the loft for handmedowns or in the charity bag.
I helped my friend decluttering her home, she was much more chaotic, bordering on hoarding, and it wasn't so much decluttering as actually getting rid of mountains of stuff. In that type of scenario it can be very overwhelming. We tackled it by setting a timer, doing 20 minutes, boxes for tip, charity, or keep- and then after the 20 minutes before moving on, we dealt with those boxes (charity boxes to her car, tip boxes to my car, keep boxes to the right places), then set another 20 minute timer and did it again. This prevents that 'moving things about' feeling where you're not really getting anywhere, and also prevents you from just making a job that will take you hours (eg having 50 things to list on eBay which is so mind numbing I never want to do it, although listing say 5 things is no problem)
Another tip I gave her was every time you get one of those free charity bags, on the night before collection day, whizz round and fill the bag, and put it out for collection. We get lots of those so that helps but it's a drop in the ocean if you're very overcrowded. I'm lucky too because we have a charity shop, with parking, right by school so it is very easy to stop off. Could you factor charity shop drop off on your way to supermarket/kids clubs or something so every week you take one bag?