Answer:
Instructions to installing a sink can vary greatly by the make and model of the sink. Some very general and basic steps to installing a new sink would be:
1) Turn off the water supply valve to the old sink
2) Remove old sink, noting sink dimensions and attachments like faucets, hoses and supporting hardware.
3) Purchase new sink and new attachments (if needed) that will fit in the space and accept the attachments from the old sink.
4) Install the new sink and reattach all faucets, hoses and supporting hardware.
5) Turn on the water supply valve and test for leaks
For more detailed instructions there are many Do-It-Yourself (DIY) books and videos online and for purchase in every local home improvement store.