We too have been going through this thought process for some time, as we have a fairly big house, in a large garden, with a holiday let to manage as well, and both of us have health problems. Having hum'd and haa'd for ages, we made up our minds yesterday to go for it and put ours on the market. Today, having read the contract from the agent, we have changed our minds!! If you do go for it OP, do please read the small print with a fine toothed comb, as we discovered that, if we can't find a place we would like to move to, but the agent finds a 'ready, willing and able' buyer, we would be committed to pay the agents fees, even if we pulled out!! There were numerous other T&C's that we weren't happy with, so we've now decided to stay put, and with the ongoing income from the holiday let, will pay people to look after the garden, decorating, cleaning, etc. for as long as we need to.
Also, with the market being so busy at present, please be aware that agents will not allow you to view a property unless you are in a position to proceed, ie, if you have already agreed a sale on your property, or at minimum, got your house on the market, so for those who suggested viewing a few places to get a feel as to whether it would work for you, at this period in time, I'm afraid that is unlikely to work. As someone else suggested, why not have the property split into two flats, you could then remain where you are, and have an income. Finally, (sorry it's such a long one), do you have any children, who might have a suggestion that might work for you?