You will not go from 250@ 32% bf to 205@ 6% bf in that time. In 6 months you could look like a completely different person, hell, you could do it in 3. Unfortunately, about 1 in 1000 people have the mental attitude to make that transformation. Here is a scenario...
You are doing any type of cardio and your muscles start to burn to the point you are crying.
The above average person will stop, rest, and get back on. The person who will make a total transformation in 6 months will go another 5-10 minutes without stopping. It is a mental thing, not a physical thing.