Over at zenhabits.net are the Four Laws of Simplicity, and How to Apply Them to Life.
First, the laws themselves:
1. Collect everything in one place.
2. Choose the essential.
3. Eliminate the rest.
4. Organize the remaining stuff neatly and nicely.
Second, you can see how to apply them the zenhabits way by reading their article.
Third, you may find after reading that that it is harder than it appears. If so, here are some approaches to deal with this.
One approach to the “almost everything is essential” problem: get rid of big items. For example:
1. Collect everything in one place but do it on a piece of paper. Group essential things together. You can sketch this out: don’t try to list everything.
2. Choose the essential. Since everything is essential (you think), work hard at putting some big things in the non-essential pile. Go for things that take up alot of space, or take alot of time to manage. It may not be many things, but it could make a big difference.
3. Eliminate the rest. You know what to do.
4. Organize the remaining stuff neatly and nicely. Having gotten rid of those big items, you should have room now.
Another approach to the “almost everything is essential” problem: get rid of duplicate items. For every item you have multiples of, pick one of them to be essential and get rid of the rest.
A third approach is to either deep store or lend out items. When you do, write down on a list somewhere what you dealt with this way. You will likely find in six months or a year you haven’t missed them.
A fourth approach is keep like things together. That way, if you cannot get rid of things this time, at least when you eventually have to, you have already achieved the first step of having everything in one place. Also, you likely will find from the way you use things that some things you use all the time are essential and other things are not since you never use them.
A fifth approach to eliminating things is to say: how hard/expensive would it be to replace a certain item? If the cost is negligible for you, get rid of it. Better yet, lend it out, give it as a gift, recycle it into something else.
Smart People I Know 
The art of simplicity. Great advices… tha I need to apply !
Thanks.
Good luck!
I’ve been consolidating everything in one place after having a storage space on the east coast and moving to the west coast with very little. I recently brought back much of my storage space stuff and realized I have FIVE complete sets of silverware. One set is my grandmother’s 100% sterling, one quality set of stainless from when I was married, two sets of old silver plate (that were my mothers) one set of cheap ikea. That’s just too much!
Of course I’ll have to keep the sterling and probably the stainless, because I would be afraid of using the expensive stuff everyday. That already seems like to much, but the rest has to go.
That’s a great example of this! Congratulations to you. I am trying to do it myself. It takes time, but it is worth it.