but honestly its just going to be a confidence issue. most backyard PVC setups are quite low to the ground, which gives you more confidence to try tricks. just sack up and do the tricks and you'll find that you can do them on pretty much anything
But I agree...anytime I set up pvc in the backyard its so much easier to stick it at home, then on the mountain on real rails. Mostly confidence though...at home I'm sure no one is watching you fuck up repeatedly... unlike on the mountain where you might be waiting in a line just to hit something. Practice makes perfect my friend. its your subconscious not wanting to make a fool of himself.