I can't say whether you have too much stuff or not. However, I just recently did a ruthless declutter of our house and am able to keep it neat almost all of the time.There is much less stuff to put away. For instance, we have only 2 sets of sheets/bed. All the rest went. 2 towels/person, etc.
I started with the garage and then went room by room with 2 boxes and one bag.
Box 1-keep I made this the smallest box. Instead of putting stuff away, I taped these boxes up, dated them and will revisit them in a few months to decide whether they are essential items or just clutter.
Box 2 Sell biggest
Bag Throw away/recycle
I assisted my 2 boys in doing this in their rooms. DD decided to do it herself.
We had a garage sale last week and made over $500!
Are you at the breaking point where you feel you absolutely must change this now?
That's where I was. I began working out of the house last year and it all just piled up!
If so, you may want to send DH away with the kids to a museum day or something like that and tackle it all at once. It's exhausting but it's done. Then you can establish a schedule of regular decluttering.
If you are not at the breaking point and need regular structure to achieve an orderly house, I suggest http://www.flylady.net
I know she gets a bad rap in some circles for being completely nuts but she was a God-send to me when I had little ones.
After my big declutter, I use her schedules to maintain an orderly house. She also has a FB page set up for small decluttering tasks to give your kids every few days.
Another inspiration for me was the boook Material World. It's a photography book showing families from all over the world in from of their dwellings with ALL their posessions. Sobering when you compare the family in Mali to the one in Texas!
Good luck sister! You can do it.