AI am making a spiderman cake for my son's 3rd birthday, and will be using a polystyrene head (please don't judge, I am not skilled enough to make it out of cake without it collapsing!)... Not sure where to start? Do I cover it in two parts? I.e. front and then back? Any help would be most appreciated?

AJust go for it! If it doesn't work one way, ey, it's styrofoam! You can just peel it off and try it the other way! Just apply a thin layer of shortening to the head before you start.

AThank you for your helpful responses... Fingers crossed, will let you know how I get on!!!