Whether or not you can fit the sink yourself will depend on your confidence in doing so.
Many people successfully install their own sink and most sinks come with installation information, although this is not always thorough.
We do recommend if you are unsure at all to enlist the guidance or assistance of a plumber to undertake the fitting. Some sinks require the worktop to be cut out before the sink is installed, it is a good idea to establish in advance with your plumber if they are happy to undertake any worktop cut outs as well as what will happen should anything be damaged during the installation process. If they are not happy to cut the worktop, although many plumbers are, then you may require a carpenter for this aspect.