I also nuke mine for a few seconds. Just be careful because you can burn yourself. I use plenty of crisco and treat it gingerly. I also make sure I take off my rings too - I've also heard you can use crisco to pinch a rip together too - but I've seen Duff use royal....I've been lucky - every time I've had a rip or a tear, I can place a decoration on top of it.
PS - Make sure your cake is all set to go before you start rolling your fondant. Sometimes it dries out quickly. I use MMF.