wizzair,ryanair, centralwings, should all fly to Krakow or Katowice from Dublin, depending on where in the south you are going that should be the best. Would not recommend the trek from warsaw down south in winter unless you really want to.
language won't be a problem, majority of young people speak very good english but knowing a few words would be nice esp thank you etc.
Usually get a good price, but booking now for Christmas time flights will probably be expensive.
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