Most homeowners know the value of their home, through observing other properties that are similar in the area that may have sold recently. If you go to the property price register you can check what has sold in your area and the final sale price.
You can also check out Myhome.ie and Daft.ie which may have similar listings on the market.
Check with a local estate agent – most sellers will contact a local estate agent in order to get an overall view of the market, a valuation price and also a marketing plan in order to understand how long the process will take and what steps are needed to progress the sale.