Dutch · Pronunciation Guide
zayn — barely-voiced z, then the ij diphthong gliding from "eh" up to "ee," and a final n.
Weight depends entirely on which "zijn" you mean. As the infinitive "to be" it can take a beat, especially at the end of a clause; as the possessive "his" it is normally unstressed and leans on the noun. The spelling gives you no clue — only the syntax does.
Listen: zijn
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Ik wil gelukkig zijn.
I want to be happy.
Listen: Ik wil gelukkig zijn.
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"Ik wil gelukkig zijn" pushes the infinitive to the end behind the adjective, the mirror image of English "I want to be happy." Because it lands last, the diphthong is fully exposed and there is nothing after it to hide a sloppy vowel — a good sentence for auditing your ij.
Seeing z-i-j-n, English speakers guess "zine" with the vowel of "mine." That open "ah"-start belongs to a different diphthong; Dutch ij begins mid-front. A second confusion is lexical rather than phonetic: "zijn" means both "to be" and "his," and beginners reading a sentence often pick the wrong one and then can't parse the grammar.