I am a commercial property lawyer and generally don't deal with house buying & selling. I have however moved a lot of times in my life and there are some things I have never done:

1. I have never tried to co-ordinate the sale and purchase of 2 properties - I always move to rented first. 

2. I have never moved on a Friday. 

3. I have never tried to move at Christmas. 

4. I would like to say I have never moved myself using a hired van, but I would say removal men are worth their weight (usually considerable) in gold. 

There are good reasons for this, many set out in the article below. To those of you trying to move at this time, good luck! Don't be afraid to break the chain, I promise it is worth it!