Whether or not you can fit the sink yourself will depend on your confidence in doing so.
Many people successfully install their own sink.
Most sinks come with installation information.
If you do not feel comfortable to install the sink, then enlist the guidance or assistance of a plumber to undertake the fitting.
Some sinks required for the worktop to be cut out before the sink is installed. You may wish to establish in advance with your plumber if they are happy to undertake any worktop cut outs. If they are not happy to do this, although many plumbers are, then you may require a carpenter for this aspect.