As much as having 2 in nappies is an extra expense, if Lily is not ready then don't push the fact as it will only cause further frustration and confusion for her. I was thinking of doing the same but my DD was not ready so I didn't push the fact. She hadn't got to the stage where she'd tell me her nappy was dirty, she would have been happy to sit in a yucky nappy all day give it half a chance. :-s

I think now he is born, she's gone through a few stages where she has given up the dummy as she is the big girl now and only babies need dummies, and gradually we are working on the whole toilet issue.
We have a very basic potty in the bathroom, she always comes in with me now and will sit on her potty (with her nappy still on) etc.
I let her wear knickers for a little while during the day so she can feel how much better it is. She's only just grasping the concept now but has a long way to go and when I look back, she was no where near it at 20 months.

Once your 2nd baby is born it's amazing how quickly the older one grows up. My little girl went from being my baby to this independent little thing, we still have a while to go with the potty training but she's only just grasping the whole concept now.

Fingers crossed this is the month for you btw