OK we have moved 12 times since we have been together (10 years) and well we dont actually find it very stressful now as we know what to expect.
IF short distance and you can have an overlap in moving in and moving out then do it yourself, buy a cheap van and well go for it. IF its a 1 day turn around then I personally would say get the professionals in and if you have a little extra cash pay them to pack it all up for you,. it makes things so easy you carry on with life and let them do EVERYTHING.
DONT expect everything to go 100% perfect, solicitors and well everything fdoes go wrong, the amount of time removal trucks are sitting outside a property for hours waiting for the completion to go through is stupid. DONT arange completion on a FRIDAY, this seems to be the busiest day and things drag on, try and complete mid week, you mill find it easier to find a removal company and be able to negotiate a cheaper deal.
Play removal companies off against each other they are all competeing for your job, dont just look at companies where you live, look at where you are moving too, it may be cheaper.
If you have kids (as you do) ship them off to someone else for the day.
if you are not getting a removal company to do it, ASK FRIENDS, bring beer and food, dont give beer out until you are moving IN.
With both friends and removal companies the very first thing you MUST do and I mean MUST DO is offer them a tea or coffee as soon as they arrive and keep them lubricated during the entire move. you MUST also offer bacon butties for breakfast and a sandwich for lunch, you will be surprised home much of a difference this will make, if you make the effort and treat the 'staff' right they will go the extra mile for you.
DON'T just rely on removal companies, check a few of the shipping companies out as some do both but due to cut backs have now gone shipping only but still have the facilities to do removals.
errrrmmmm what else can I suggest?
Where you moving too and from? (I did have your addy but cant remember) as I may be able to help as I used to do removals - well when I was a fit young lad so may be able to give some advice
if you ignore the above or even if not good luck with the move and hope all goes well - just remember keep the people doing the work supplied with tea, coffee and bikkies above all else