HELP, HELP, HELP asap!

Too dry, add some more liquid, water, milk, liquid coffee creamer. 
 

I would say it was too dry too, maybe take a small bit of the buttercream add a small amount of liquid and do some test roses to see if that helps.  Sometimes it doesn't take a lot of liquid to make a big difference is ragged edges.  Hope you manage to get it done soon x

Do you have a 2D?  I think it looks the same as a 1M and takes less icing if you are short.  My best guess is too dry.  I would take a small amount of icing and add some liquid and give it a try before doing the whole batch.  You really only need it stiff enough that it holds it's shape, no need to have it overly stiff.  It should flow easily out of the bag/tip.  It shouldn't take a lot of force to push it out.  And it really is a simple but impressive design.  Have you done any of the swirls on cupcakes?  Should be just the same on the cake, circling from the inside towards the outside.  When you are done, put some comma's of icing in the gaps if your crumbcoat is showing through in spaces between the roses. A consistency that works for a shell border should work for the rose swirl also.
 

Here's a hint I learned from an old time baker.  She said to eliminate ragged rose petals, mix two batches of icing.  One with more moisture than the other then "stripe" the bag - first with the moist icing then backfill with the stiffer.  Then make sure your tip is pointed in the right direction...............pointed narrorer edge directly on the moist icing - fatter edge on the stiffer.  The reason it's breaking is because your icing is too dry and stiff but you need the stiff icing at the base so your rose won't colapse.

Are you using a high-ratio shortening?  I know that when I've made BC before without the high-ratio I got the ragged edge.  Might make the difference.

Did you put a splash of Kahlua in a glass for you too?   Glad you got it to work.  The swirls should be an easy thing, make a batch of cupcakes sometime and just do some swirls to get the hang of it when you have more time to play.  Your friends/neighbors/kids will love you.  And be so impressed.  Remember if you add a little liquid at a time you really can't do any harm, you can always add some more powdered sugar.  The consistency for a rose swirl is much softer than what is needed for a rose on a nail.  You are doing fine!  Keep it up.
 

No need to bake to practice swirls. Turn a glass upside down and practice on that. Good to hear you got it worked out!

Have one more drink then upload the photo again,,,,,,,,,,,,,,it didn't take.  :-)