
Don't worry too much about kana. It feels impossible now but it will become second nature. At some point you will hate it when someone uses romaji since kana is so much easier to read.
I do remember using the "Remembering the Kana" book: http://www.amazon.co.jp/Remembering-Kana-The-Hiragana-Kataka... which I can recommend 100%. The 3 hours claim is accurate from what I remember but do follow the book's suggested breaks.