On your first coat wipe the brush on the inside walls of the container of resin after you dip it in. That way you won't get resin drops accidentally on your part and you are forced to work in very thin layers like mkshane said.
I recommend using a thin coat on the outside of the part first, just to seal it up. Then let it cure and apply a med/heavy coat on the inside. Then 2-3 more coats on the outside.
Aside from your respirator and gloves, you'll also want to wear a long sleeve shirt, pants, and shoes. Its not fun when you get that stuff on your skin.