Personally, I thing squares are easier, but I know others prefer rounds.
Tips:
Don't roll the fondant too thin. It will wrinkle easier if it is very thin. You have to 'unstretch' the excess, and it is easier if your fondant is about 1/4 inch thick.
Elevate your cake a bit, so the excess fondant can hang down.
If you make a wrinkle, it is unlikely you can get it out, so be careful
Try practicing on an inverted cake pan- no waste. Just moisten the pan a bit, so the fondant will stick. When you are done, knead it well and you can start again.
I find squares easier to cover with fondant. Whatever the shape, working quickly is really key. Your fondant must be really smooth before rolling it out, otherwise all kinds of problems will be very visible.
I can give you some tips for working quickly if you want to PM me.
Michele
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