Lots of good advice here.

I also ask my students not to apologize for their errors, but it's a difficult habit to break, isn't it, because you feel you might anger or insult that person if you use their language wrong (and sometimes you will!) . I tell them "a mistake is only something that hasn't become automatic yet...why apologize for that?" 

Dreaming: I have never dreamt in a foreign language despite having lived in a totally German-speaking environment for a longer period of time. I spoke only German all day, and dreamt only in English at night. Now I'm fluent in German. learn several other languages.... and still only dream in English. What does that say? 

Also, lots of us want to rush ahead to fluency without taking the time to swim around in the basics until we have them down perfect. It's good to see someone encouraging people to do that, and resist the pressure to constantly ask "When will I be fluent?" or "How long do I have to learn until I can put C2 on my resumé?"  Questions which have no answer and are counterproductive to learning.