If working in a confined area, a powerful fan to assist with airflow through your working area will help a bit to save you breathing in more fumes than necessary and let your neighbours know what you are up to. Also wear a respirator so you don't breathe in the fine airborne fibreglass dust strands. Cover your arms with a long sleeved shirt, or you'll be scratching like an alley-cat in the middle of the night. As you'd realise by now, the stuff stinks and get right down in your gut's.
Nomadpete is right about the order of applying Carnuba wax followed by release agent before a gel coat, and I also have normally started off with a tissue layer following the gel coat which is pretty smooth and wets out easily, and then go straight out with the chopped mat previously cut to approximate shape. This should give you a smoother finish with minimum pin holes to fill later, and my view is that one layer bonds better to the previous layer if still a bit wet. As also mentioned, try to get a bit of and overlap on each layer which adds to the overall strength.
Good luck mate, it's not really very hard to get good results, and if anyone can do it, you can.
Rgds planey