Annette - I wouldn't force a short nap in the morning, you will get an OT baby by second nap and you won't get the longer nap you are hoping for
For those about to force the dropping of the CN. LO has to be able to handle a 3 hour A time... if he/she can, then go ahead and give it a shot! It does take a few days to a week for them to adjust though... be warned that you will have a cranky baby for a bit while their body adjusts
When I did it, I moved BT from 730 to 7pm. Our longest A time was 3 hours