K, dude, I started in, like, January. I got a respirator on monday. (yes, this is august.) RESPIRATORS ARE A GOOD IDEA! But you're not gonna die. HOWEVER - ALWAYS ALWAYS ALWAYS work fiberglass resin in LOTS of fresh air, with LOTS of ventilation. I do my work outside on the back patio (Much to the dismay of my mother. Need to get a few resin spills cleaned up, lol. j/k) And, for the love of all that is merciful on the green planet, Don't inhale the flippin' vapors if you can help it. Sure they smell funny, and they're TOXIC. They will eat your lungs away very slowly.
Hope this helps.