How to structure comparative essay on Romeo and Juliet?

I have to do an essay comparing Juliet's soliloquies 'Gallop Apace' (her waiting for Romeo), and 'Farewell!' (before she takes the potion). I've got all the comparative points under wraps but how can I stop it from being repetitive, like: The tone is .... in the 1st one but like ... in the 2nd one. And so on. How would I write an introduction and conclusion also?