Get a good Solicitor, I have moved 5 times (recently a year ago) in the time you have been in your present house. Access to your Solicitor at key stages is very important. I did most of my contact by email including sending copies of urgent documents (scanned) to let people see them ahead of the hard copy.
Be prepared to be let down and disappointed so try to be "disinterested" in the move, it saves anguish. Trust nobody to do things, continuous project management is invaluable so open your file now.
Have a very clear idea about how much you will include in your house sale, it's surprising how much people will try to negotiate out of you if exchange of contracts gets closer.
Be resolute, in the end you will get there and it will be worth it.