You already understand that decluttering is an essential first step. I did this ruthlessly over a period of a month, with regular trips to the charity shop, recycling centre and a storage unit I rented (unless you have a garage). I collected and purchased strong cardboard boxes from eBay, bought one of those tape guns and spent a few hours every day packing up my books, photo frames, ornaments, kitchen equipment, seasonal clothing,shoes/boots, spare coats etc. If you are having viewings your house needs to look roomy, airy and with rooms the viewers can contemplate living in. Boxing things up also takes the pressure off when you do finally move, as half the work has been done. I would only allow viewings on one weekday evening and the following weekend day, as I didn't want to give over my life to preparing for the agent. I was never present for a viewing, and never showed the property myself, why pay them unless they are doing the work! By the way you can put in an offer without having an offer on your house, the person who said that was wrong. However, I instructed my agent to only show my house to viewers who had sold, I refuse to be in a long chain. As your house is big too, you will find that unless you snaffle a cash buyer there will be a chain. Because of my previous experiences, I am always prepared to sell without another property to immediately move into. I put all my belongings into storage and rent a furnished flat, unless it is just a few weeks then I move into a hotel. The stress of collapsing chains in England are too much for me! My last and final move, six years ago, went swimmingly well, and although I did declutter I am still taking boxes to the local charity shop - you can never be too ruthless.