The polite way to pronounce this word is, "are - TIZ - ah - nahl." It's best to avoid pronouncing the last two syllables like the word "anal" -- people will just laugh.
According to the pronounciation listed at dictionary.com you pronouce artisanal like this. ahr-tuh-zuh-nal. You could break it down this way too... art is anal. Hope this helped.
