You need a micro-SD or micro-SDHC card in order to root your nook. I personally had no problems with getting it to work, but there have been others who had problems, but I think they were all eventually able to resolve them.
My take on the nook is that the standard ebook reader app is OK, but the library app needs to be scrapped. The B&N library app is marginal for navigating B&N purchased content, and abysmal for navigating sideloaded content. It's clearly not designed for someone with hundreds (or thousands) of books and wants to keep them all on the nook. Since my ratio of sideloaded content to B&N content is at least 50-1, if I couldn't root my nook, I probably wouldn't have bought it.
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