I just mastered the flexy rods and I LOOOVE THEM! I was roller impaired and I couldn't roll my hair to save my life. But the flexy rods were so easy!
The only tips I can add are:
Use end papers
You'll probably need more rods than you think you will
Remember to bend the top of the rod in the same direction you rolled your hair in
When the curls go flat a little...you can always pin it up or mist with water for a wash and go look
And off topic: You sound like me...I love styling my hair too! I can't WAIT til you get a Fotki!!