Regardless of any advice, remember one thing -
The employer is always the bad guy -no matter whether a large corporation giving jobs to hundreds of people, or a struggling young person like OP.
An employee can get away with almost anything and if you sack him/her without a long-winded procedure then you can be in trouble. You on the other hand must tread very carefully -no rudeness, no comments that could be wrongly interpreted, nothing that in any way could be used against you in any dispute.
If your business goes broke they'll get redundancy and two hundred euros in their hand every week. You get nothing -you are an employer so deserve nothing, and how dare you let your business fail and not provide employment to other people!
And how dare you not know the thousand and one rules and regulations that are churned out by securely employed public servants and their masters in Dublin and Brussels.
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O.K. The above is exaggerated tongue-in-cheek and I've rarely had a problem with an average of twenty employees over the last 25 years, most of whom stayed with me for an average of 15 years. I've now closed much of my business and my employees left on good terms,and am still friendly with them.
BUT I'm just getting across the opinion that some people - have about "employers" -(just as they do about "landlords" who are equally as scummy).
Being aware of what these idiots think helps in ensuring a smoother employer-employee relationship.