I have only ever bought one house before and as I was a first time buyer, I didn't have to co-ordinate the purchase with a sale.
If you have to sell your current home at the same time as buying your next home, what's the order you do things in? Do you start looking at potential new houses first, and then only market your property once you've found one, or do you put your place on the market, start looking for somewhere new, and just hope that you get an offer around the same time as you find where you want to move to?
What happens if you get an offer on your house but you haven't found anywhere to buy yet?
What can you do if you find your dream home but haven't got a buyer for your current home?
Etc.
Please help the bewildered.