I didn't have any real trouble with sections falling but your mileage may vary and it's good to be prepared! Reattaching cone and gluing wefts on: Wedge the cone into place on the head and sew it on however you can, I pulled the elastic wig structure over the sides and sewed it to those as well as to the elastic pieces under neath it.
The pink part will be about 20.
I wore one star for half of one day and all of another and had no problem with it coming off.
Let any glue dry before continuing.
Don't try to rush this part, work in sections and let it dry as you go.
I traced the spear onto the foamies and cut that out then trimmed it until it fit.