This page shows you how to fit T-Nuts to the majority of upholstered Sofas, Chairs, Footstools and some Beds. The assumption is that your furniture does not have legs fitted at present. If there are different size T-Nuts already in position then they can be easily removed by levering with a screwdriver.
You will need access to the inside of the furniture which may mean removing
(un-stapling ) the fabric (or hessian) covering often found on the underside of such furniture. The covering can normally be re-stapled in position using a standard domestic stapler.
If you remove the hessian and then realise that you cannot get access to the top of the wooden rail, you will need a different type of fixing. Refer to the section titled “Select a Fixing”