Skateboarding help please?

I have been trying to backside ollie 180 for about 3 weeks and im sick of it i just wanna be able to do it.My freind told me fakie is easier so i tried it and it seems easier but i just can get my back foot on. I do it perfectly and everything but i cant get my back foot on and i know that i can land it if i put my back foot on this is so frustrating. how do i get my back foot on?