I found a shortage of information to install LP orifices in place of the natural gas orifices. It tells you what to do, sort of. Removing them was not a problem until they dropped down inside the range.  Then I had to figure out how to remove the top to access the lost orifices.
To change the oven orifice, it says to remove the door.  No instructions in the brochures, so I had to go on line to find out the manual is written for a different method of door detachment than what my new range had.  It was a little time consuming and frustrating.  It is working ok, but the flame control is not what I wish it were.  It is better than the old GE we removed, but still not great at a lower flame level.