Calibre is without question the best option for managing your e-book library. The only way I can think to get the rest of your Kindle books into Calibre is to send them to your Fire and then upload them to Calibre. If you think you may want to ever read them on anything other than an Amazon device, you might want to look into augmenting Calibre with some help from Apprentice Alf (google search) before you import the ebooks into Calibre. Sending 500 ebooks to your Fire and then uploading them to Calibre is bound to be tedious, but not as bad as a spreadsheet! Also, once done it is amazing what you can do in Calibre to organize your library. Good luck and welcome to the forum!!
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