Help with getting started: exclude category?

Hi Aaron,

Thank you for great plugin. Sorry, I bit struggle to understand some basic things about how plugin works? Can you please help me with:
1 – if I want my posts to be removed after 60 days – all I have to do is enable plugin and in “Default Date/Time Duration:” chose custom and put in field: “+60days” Is this correct or I got it wrong?
2 – is there a way to exclude categories? SO I want posts in ALL categories to expire except category “blog”. Can I specify this somewhere?
3 – Will this effect only new posts? Created after I activate plugin? Or will this effect all posts in my website, so post that are published 63 days from today will be deleted today if I activate plugin now?

Looking forward to using this plugin. Thanks
Cheers
Dean

http://wordpress.org/extend/plugins/post-expirator/