Once you start it just gets easier and easier!
I started decluttering in the last three or four months and to begin with I got rid of the obvious bits ie kids craft shite/paintings, there were hundreds, I photographed nice ones and threw them all away bar one or two. I chucked away broken toys. I charity shopped some t shirts that didn't fit.
As I went along I had some tit bits from mn about the kondo method and general decluttering advice and that helped make some of the harder decisions.
I've not regretted getting rid of anything. I photograph some sentimental bits but I still got rid!
It was a revelation to know and accept that my MIL enjoys shopping and buying us stuff but I had no obligation to keep the stuff. She has had her enjoyment factor already (doing the shopping) so I could charity shop it all. If she had to have all the stuff at her house she wouldn't buy so much!
Letting go of guilt and worry has been a wonderful side effect.
My kids are so much happier now we can keep on top of the tidying because there is just less stuff!
I feel I can make quick keep or chuck decisions now when before I have felt tangled up and unsure what to keep and what to through away.
Some things can live in a cupboard for 6 months and then I know they've got no purpose in my life and they can go.