Hi Brill,
first of all....RELAX!!...there is nothing to worry...IELTS is not like CAT,GMAT or IIT entrance, if you know basic english then you can clear it easily...for the listening part the best option is watch foreign channels like STAR movies, BBC news etc...try to follow what they are speaking, still better way is to rent english movies which have english subtitles (most orig DVDs have subtitles) so you can listen to the dialogues and also read them on the screen to double check your understanding....for the writing part, pick a random topic everyday and try writing an essay of 200 words using Microsoft word on your computer, then run the spell check and see how many spelling and grammatical mistakes you have and try to correct them, follow the step on a regular basis and you will improve your writing skills..and if you have a bad hand writing like me..

then try to write in broken and not running handwriting....also you should have got 2 CDs free with your IELTS registration...use them ...and there is a link on the IELTS website called "Road to IELTS" login there using your roll no and try the sample tests...the only way to build confidence is to practice..practice and more practice...rest leave it to god..
All the Best & God Bless
Cheers,
Rishab