Removal companies (not ‘Man and Van’) are well used to this. They know what they are doing.
Check with your solicitor when you exchange what time completion is planned for.
Get quote and tell your removal co.
Either do your own packing or pay for removal co packing service.
If you do it yourself do not underestimate the number of boxes needed. We had over 130 for a 4 bed semi. Packing took 2 weeks, in amongst everything else.
Either way have ALL belongings packed, boxes labelled, by the evening before completion. Only keeping clothes for the day, bedding for one night, essentials like tea, coffee, kettle, mugs, cleaning kit. Clean the cupboards etc that have been emptied and packed.
The removal co will arrive and pack the van faster than you think possible. They will dismantle your beds, and out hanging stuff from wardrobes into a cardboard wardrobe. Keep completely out of their way except for making them cups of tea.
Clean behind them as they empty rooms. Once packed, they will leave, almost certainly by late morning.
Clean! Until about 12 or so.
Pack the cleaning stuff in your car, lock up, drop off keys at EA or put through letterbox as agreed with EA.
Drive close to new house, await call from EA or solicitors saying you can pick up new keys. Call the removal team (though they are probably outside).
Go into new house, check all OK. Show removal team which room is which as per your box labelling ‘bedroom 1 / 2 etc.
Stay out of their way while they unload, but close so that they can shout for instructions. They will put your beds together.
If they have packed or supplied the boxes for you to pack they will probably arrange to collect them at your convenience. When you see how much space boxes take up you will be grateful for this! Though local
Facebook and Next Door sites are great for passing on packing materials.
If you are not moving locally the removal company will discuss with you packing the van and driving down the day before completion, or else packing and driving down on the day and unloading the next. You can then plan what you do accordingly.
Good luck!