The whole system needs a total overhaul. It is not fit for purpose. Problem is that there is no proper contract until right at the very end, when contracts get exchanged.
Up until that point either seller or buyer can just pull out of the process.
When I sold my house in East London in 2019, the original buyer pulled out on the day I was actually getting in removal companies for their quotation. I was in tears.
BUT.....lovely lady at Estate Agents Office asked me to give her one more month ( I wanted to stop everything), and within less than a week she had found a new buyer, who paid me more than the one who had pulled out - and my preferred choice of flat was still on the market and ten grand cheaper than when I had first viewed it. Both sale and purchase then went through within three months and the pain (like childbirth) became a distant memory.
Do ensure that whatever you are selling looks good for someone to buy. Always worth paying out a bit of money to have hallway painted (this is what the buyer first sees), garden tidied up, everywhere clean and neat. First start is you getting rid of stuff.
Some people like to be do their own showing to prospective buyers, but I found it easier to be out and to let the EA do that, less tension for me. You want honest feed back if people decide not to put in an offer.
Do not think it is going to be a quick process, it took me nearly five years preparing to put the house on the market. Allow at least 12-18 months for the process to take place. Don't get too fixed on what you want to buy, until you have a really firm offer on your existing property proceeding, you are not really in a position to make your own offer.
Most people are NOT cash buyers, many who claim to be just mean that they will not require a mortgage, and will be paying in full from the sale of their current property. They will usually still want a good survey.
Get your own paperwork in good order. If you have had any work done on your property in the past few years, sort out receipts and certificates. You will need official ones for such things as replacement windows, chimney sweeping, central heating/boiler servicing. etc.
work out your monies.......You will have to pay for Estate Agents fees, your own surveys, solicitors both for sale and purchase, removal expenses and probably new furniture when you do finally move. These all take a big bite out of your sale monies.
Take a deep breath and go for it.......Most of us who did finally do it are so happy with the result.