Blackbird nest help

Hi, 

I have just discovered what I’m pretty sure is a blackbird nest in my shed with 5 eggs (lucky timing as I was planning on knocking it down next week). But I have lots of seagulls, magpies, crows, squirrels and cats that come to my garden, just wondering if there is anything I can do to protect the nest? The shed has no glass in the windows as it’s very old and was there when we bought the house. Any help would be much appreciated.

thanks in advance