'Blind leading the blind' Can anyone tell me if there is an equivalent expression in German? I was having a discussion with a group of friends who are learning German, and the topic was something that none of us knew much about, so we felt like 'the blind leading the blind' i.e.we weren't able to help each other at all. Thanks for any help.

Can anyone help with two questions? How do you say 'my favourite season'? Is it 'meine Lieblingssaison'? And how do you say ' by (a date)', as in 'I must send a report by 28th February'? Thank you for your help.