Hi Pegesus & Welcome,
In response to your question, I wouldn't advise skipping Phase 1, as it is an important part of the plan. (And believe me, NONE of us relished the idea of Phase 1!!!)...But the purpose of Phase 1 is not actually to drop a large amount of weight-that (happily) happens as a result of it. Phase 1 is designed to detox your body, get rid of carb cravings (which I am afraid will NOT go away without doing this phase...thus making it harder on yourself in the long run).
Also, you are NOT strictly losing water weight in Phase 1. Some, of course is water, but my limiting the intake of carbs our bodies begin to process the food we eat differently. You are actually losing some fat in Phase 1. You should really read the book..it is an excellent way to learn about the important changes your body will be undergoing...altho, personally, I think Dr. A should have had a better editor...kinda choppily written in places! But the content is good and helpful. I refer to the book constantly.
Now of course, if Phase 2 (where you would like to start from) istotally different from your normal way of eating, naturally, you will probably lose weight, slowly, just from the change in habits alone...however, bear in mind what I said about the carb cravings...I was a carb addict (really) before this...my whole diet was based around pasta & bread with a few veggies thrown in for color!
I can honestly tell you, that after I finsihed Phase 1 in january, I have not touched bread or pasta & more importantly, I don't even want to!
Only you can decide what is best for you, but IMHO, I would do Phase 1, because I unerstand the importance of it.
Good Luck
January