If you want to be an awesome possum UTAU user, one of the MOST IMPORTANT THINGS is to know hiragana. It's not hard! (means the exclamation point in a cheery, 'we can all do it!' sense, not the usual, 'I can do it, why can't you?!' sense.)
The way I started out learning hiragana was just making hiragana USTs. Most of the banks I had weren't romaji compatible, so I just had to use hiragana. I'd see what I typed and what it came out as. It was a fun c:
Then I printed off hiragana charts and put them on my desk. Whenever I saw a string of kana, I would pick up my hiragana and katakana charts and try to decipher how to say the kana.
Knowing hiragana is especially important, and it annoys me to see UTAU user making no conscious effort to at least learn hiragana c: