All you need is a good dust mask. (N95) and a bunch of disposable rubber gloves. (Tip Put two or three pairs on at a time. Remove one at a time as they get dirty.)I had played with fiberglass years ago but have not in probably 30 years so I am sort of looking forward to trying that as well.
Remember to think through the whole process and have all the stuff you need ready to go before you start.
Here is a good bunch of videos about how to fiberglass. boatworkstoday.com
I apply a bunch of sunblock to my arms and hands. (Neck and head too if I'm grinding or cutting it.) The sunblock helps stop the glass from getting into your skin. It works well.