Start by taking everything out of the closet. Rather than grabbing things one by one, it is easier to take everything out and look at it. Then you’ll know if you have enough space for everything that you want in there.
Create a system for your clothes so you can see everything at a glance. It can be so frustrating when you’re looking for something in particular and it’s not where you thought it was. Combat that by keeping everything as visible as possible.