The pronunciation, syllable by syllable, is:
tah - with a really bright, open-mouthed "ah" sound
rrrawhn - "r" rolled at the back of the throat, very rounded "aw" sound, "hn" as in "n" with most of the sound coming through the nose
te - straightforward but with a fairly long "e"
luh - or perhaps "leu"
... all of which is way too much trouble. "Tarantell" in your own accent will do fine
Drifting slightly from the topic, the Tarantella movement of John Corigliano's First Symphony (written in memory of a popular and outgoing friend who went insane in the latter stages of dying of AIDS) is the most moving piece of very very fast music I've ever heard.