Stoves can be easily self-installed but you need building control approval (which is easily done). You may wish to have your stove installed by a Hetas registered installer in which case you do not need building control approval. more information on stove installation.
Fire place screens and spark guards help stop flying sparks from damaging/setting fire to your floor. Fireplace screens are also an important consideration if you have small children in the house or want to leave the fire unattended at times.