Thanks for the responses. I was following the 7800 instruction packet and I noticed they make no mention of adding a chain until after the limits are set. My issues surround getting the chain into the 25T cog on the rear. It just won't go all the way over. I htink the pulley wheels are in the way preventing the deraileur from going far enough. Maybe the chain is a link too long? I consider myself mechanically inclined but bike work has always ruined me hah.
Cheers
Rob