like Dave said wet the surface you want to put the decal at..i use a brush to smooth it out then i pat it with a paper towel..also put a drop or 2 of dish liquid in the warm water..it will help them slide..
this is what the New Ray toy can look like when you put a little work into it..i cut open the door and back window, added hyd. lines, added hand rails, mirrors and changed tracks..all for less than a bill..