hi I have just put my new stickers on my sherco , I got them off eBay and they look really good   . 
here is how to do it if you need help : 
1. use a heat gun on your stickers to peel off without taking paint with them. 
2. I used a spirit from the paint shop to wipe the plastics down and take all residue left behind off the plastics(forgot what it was , I will find out tomorrow). 
3. heated up the plastics with heat gun. 
4. put the stickers on (don't rush , just work out from the middle and when at the edges use heat gun to get rid of creases/air bubbles) 
5. DONE ! 
(I was helped by my dad)