Work in a service strong LBS and you'll see all kinds of boo boos. There's a reason why more and more big box bikes are coming with "L" and "R" stickers on the cranks and pedals. The amount of added effort to thread a LH pedal into the RH arm (if the arm is Al) is less then what some think. Especially if greased threads and a long lever arm is at play.

Iride01- I figured that the pro that the OP brings the bike to will get the thread directions correct Andy