If you need motivation, well I just loved the advice in
The Life-Changing Magic of Tidying Up: The Japanese Art of Decluttering and Organizing by Marie Kondo
http://www.amazon.ca/Life-Changing-M...ds=Marie+Kondo
Her rule of thumb is if something doesn't "spark joy" - get rid of it. Lots of good advice: don't collect paper, ever. Throw away all those manuals to courses you took that you'll never refer to again. And so on. It's an an easy read that will coach you on how to get rid of stuff if you can't let go.
One of my favourite pieces of advice from this book is about hand-me-downs: Don't! They just make everyone unhappy.