Body Fat

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I am soon going to join your group... though now it is 33.5 as per military calculator on http://www.fat2fitradio.com/tools/mbf/ but m aiming to get it to 20 by the year end I have nine months and 13.5% BF to loose. I know there are ppl who have the difference as their BF%... but I am a work thet has just started... though I have seen gr8 results... they are going to get better...

So those who have achieved the feat of reaching their BF goal... do leave some suggestions and ppl who are up for a challenge add me up...
My MO is to calculate after every 15 days i.e. on my weigh in days with the same calculator...

Age 26
Height: 5'5
Starting Weight- 78Kgs/172 lbs (on 7th March 2012)
Current Weight- 73.6Kg/162 lbs
Goal Weight - 55 Kg/121 lbs
Current-BF%- 33.5%
Goal BF%- 20%
Time allotted- Till dec 2012
Please help