Perhaps for the moment I should stay at reading and writing in Na'vi xD
Do not give up. Speaking and listening exercise is very important if you want to speak Na'vi. Idk bout you, but I think that speaking Na'vi is much more fun than just reading and writing it.
We at LN.org only want to build you up with encouragement and constructive criticism..concerning the Na'vi language and speaking it. No one here is perfect, and no one is a know it all, because the language is not even complete yet...but there are a good few things that we do know. and as far as those, we all would like to help.