The advise that I would give to someone considering this job is to do their Leaving Cert and do the Transition year as this would give an opportunity to get some job experience or do some voluntary work within the community.
Do a Level 5 FETAC health related course. The skills and qualities that are needed to do this type of work are a real sense of caring for other people, communication skills, listening skills, be able to take and give constructive criticism without causing or taking offence, patience a willing to give your best effort to your work.
The Investigative person will usually find a particular area of science to be of interest. They are inclined toward intellectual and analytical activities and enjoy observation and theory. They may prefer thought to action, and enjoy the challenge of solving problems with clever technology. They will often follow the latest developments in their chosen field, and prefer mentally stimulating environments.