One of the things we sense God is saying to us as a family is to travel lightly, to get rid of unnecessary stuff and prepare ourselves mentally and physically to move. To help us focus in the selection process of what to keep and what to sell or give away, we set ourselves two goals: 1. to get rid of 50% of all the stuff in the house (including furniture) and 2. to get rid of 40% of the books, CD's and videos. That should render us some space.
Now, how to prevent irrational considerations to influence our selection, like "perhaps we might need this thing sometime in the next 50 years" or "I've never read this book, but likely it offers some good insights on page 144, so it might come in handy at some point"? We use a simple guideline: we only keep those things we effectively use now or will use in the next two years, and get rid of the rest. What still has value or usability will be offered on Marktplaats or eBay, or given to a charity. We only keep those books, CD's and video's that really inspired us, offer clear 'resource value' or will be read/listened to/watched in the next two years.
The first items are already on Marktplaats. You might be interested in this original porcelan plate with a painting of the Oude Gracht in Utrecht, an extensive collection of Barbie dresses, or a 2-3 person iglo tent.