Is greek language hard to learn?

I was thinking about going to Greece this summer and was wanting to learn to speak and write greek, and if it was hard to learn and the best ways to learn it.. I know how to fluently write and speak English, Spanish,Italian and Albanian.

In 1829 when Greece became a state, for the first time, it was a small country covering the region of Morea, modern day Peloponnesus (Greece proper). The majority of people living in Morea at the time spoke Albanian, Turkish, Vlach and Slav. Athens itself, the cradle of the ancient civilization, was nothing more than an Albanian village.

http://mk.wikibooks.org/wiki/BIG_Greek_Lie_10_-_Greeks_claim_no_Macedonians,_Turks,_Albanians_or_Vlachs_live_in_Greece_today

http://www.maknews.com/html/articles/stefov/stefov88.html

http://www.ancientmacedonia.com/greekmyth.html

http://uncyclopedia.org/wiki/Greece

http://www.greekhelsinki.gr/Minorities_of_Greece.html

http://www.farsarotul.org/nl27_1.htm

http://say-macedonia.blogspot.com/2008/04/ignored-minorities-in-greece-turks-and.html

http://www.iht.com/articles/2007/09/26/asia/greece.php