How hard are these chips installed and will local dealer install or not? I take it that these chips are pre-programmed with info that you specify (stock or moded)? Thanks for info!

2001 Cavalier
150-175 more kms
per tank of same size
Pioneer 12 CD Changer

SOLD Green 98 Mystique
GS Sport
Zetec ,ATX
885 Fogs mod.
Hi beam mod.
205 15s