How hard can it be?

Hmm, working on one of my songs. Sadly, my guy helping me is a really great rocksinger. He sounds like Jorn Lande. Yes, I say it's sad because he lays the pre-vocals and I am supposed to do it for real. He is amazing. I am just afraid I'm going to destroy the songs with my squeaky little womens voice. Doubting yourself, anyone...?? I stated earlier today that I am on good way finding my voice's strenght, but will it be enough? Can I go where I want to? Ok, I realize the time I spent singing is about 27 years less than my skilled collaborator. But anyway. I like a "quick-fix", sorry that can't be applied on the voice.... //MMR