Hi
At the top of your monitor Ferlin {right at the top}{PS7}you will find little boxs where you can enter coordinates for rotation,shear etc.Try using Edit transform > rotate and set the amount of degrees you want to rotate by in the little box,click the check mark and then if you go edit transform you can select "again" from the menu,so you can duplicate the thorn,rotate,then dupe again and rotate etc etc until you are finished.Its been a while since I did this myself so I may have goofed somewhere along the way in the process [saywhat] ,but see if that works for you
Stu.