The petal will definately not be an easy pan to do... the more corners and edges, the more complicated it is. I've done many carved cakes that are more complicated than petal shape, so it's possible... 
Just take your time, and don't roll your fondant too thin... treat it like you would a round cake, then gently work the fondant into the indentations between the petals (at least there are no corners like a square cake!)
tobinx-
you might want to make some cheap mmf, turn your petal pan upside down and practice covering it a few times before you do the real deal. HTH
Ohh! That's a great idea! Thanks for the suggestion!
I made the cross cake and covered it with fondant. I couldn't believe how easy it was. All I did was raise the cake with food storage containers turned upside down, and covered the cake with fondant, gently guiding the fondant into the corners. It's a really good trick I read on this website
HTH!
Mirjana
i know this is late but maybe it will be useful for next time. petal shaped cakes are actually very easy to cover with fondant. much easier than rounds, you would think they would be more difficult but that is not the case. i was making a very important petal cake that was to be covered in fondant but decided to change the shape of the cake because i was afraid it would be too difficult, but then a couple friends who had done them previously reassured me that they would be easy, and they were!
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