"Habit is a cable; we weave a thread each day, and at last we cannot break it."
- Horace Mann
If tidiness doesn't come naturally to you then getting on the clean train may involve some behavior modification. Forming new habits. Breaking the bad ones and replacing them with good ones. It's definitely not easy but let me tell you - it's possible. Horace Mann put it plainly, simply and poetically. Facts are facts and the more you work on creating good habits, the more they become a part of your every day life.
If you're overwhelmed by the number of behavioral changes that you'll have to make to get your life organized, take baby steps in the right direction. Instead of intimidating yourself with the "do"s that you need to start picking up, start with one "don't." Focus on one behavior that you know isn't tidy and fizzle it out of your life. Don't drop your bag on the floor when you get home. Don't put any old receipts or wrappers in your pockets. Don't take your clothing off and throw it to the ground. Once you've conquered that one, pin-point another behavior that you know is no good and work on destroying it. And then another! And another! You'll feel ready to welcome those "do"s once you've become so good at training yourself. And now, before you know it, you've established wonderful habits. Your room is immaculate, you haven't lost your keys in weeks, you know exactly where to find your umbrella when it's raining.
It takes time. It can take months or even years. But always keep in mind that the road to tidiness is paved with good, attainable intentions. YOU. CAN. DO. IT! Focus. Work hard. Eye on the prize. GOOOO!