Thank you both for your replies im currently 142lbs and want to be 126ish so just bought the book although im rather rubbish at sticking to anything and scared to open the book got a wedding to go to on saturday and a holiday to look forward to in August.
Why not wait until after the holiday and take the book with you - then you can read it with no pressure, decide if you really want to do this, and, if you do, be full prepped and ready to start when you get back.
I notice you have a lowish weight to begin with, so if you do decide to go ahead, you won't need long in attack - but you do need to go through all 4 stages, and a holiday can very easily derail all your best intentions.