i will have my first proposal presentation very soon. i am practising my 'speech'. it should be ok. what i am worried is that i may not be able to answer questions from the audience including professors. i am so nervous abt that. what do you usually do to sove this problem? if they really ask me a question that is diffuclt for me to answer, what should i do? any advice? thx

I have the same issues. What I find works is if you get a curly one, you say that is an interesting question and one I do not have the answer for just yet but if you would like to see me later we could discuss the aspects then. You're not expected to know all the answers in your proposal stage.
Hope this helps :)