Estate agent or not, you'll need to make sure your house is attractive to potential buyers. Preparing a property for a sale needn't cost the earth though, and the most important thing is to have a big clean to make sure your home is looking its best. Simple things like washing the windows inside and out, waxing wooden floors and clearing away clutter can be really effective. Kitchens and bathrooms are quite often the rooms that sell houses, so make sure yours are sparkling.
While there's no need to go overboard and paint everything magnolia, it might help to depersonalise your home a little. Remove family photographs and neutralise zany décor, so viewers can imagine themselves living in the space too.
Once your home is presentable, you'll need to set your price. Most estate agents make their valuations based on several factors, including local supply and demand and the price of comparable properties in the area. More experienced valuers work to criteria defined by the Royal Institution of Surveyors, which includes examining the age of the property, accommodation available, fixtures and features, construction and state of repair, position in the locality and surrounding amenities. Do your own research on sites such as Rightmove and nethouseprices to evaluate similar properties in your area.