You may need to consider if this really is for you. Once you start it's extremely difficult to walk away from. It's something you should think about.
That kind of worries me tbh because I don't want to get into debt doing this, I plan to be sensible and only do this every 3 or 4 months, but if my first punt goes well then I might be in trouble...
Why oh Why did I book this in 7 days advance, the anticipation, nerves, excitement and anxiety all in one is too much. So I'd definitely agree with others and book it on the day if you can.