thats the one bvad thing bout zooms, when you get a really good visual hallucination you get a rush of nausea right before... I've never had any trouble with puking on mushrooms though..
Depending on the potency of your shrooms, you should take 2.5-3.5 grams for a first time. 2.5 is all you really need to feel obvious changes in conciousness.. and 3 grams and up, just creates a psychedelic heaven... just wait and see, you'll get what i mean when u do them.