Hi Nikki - welcome! I'm only on day 3 and I'm finding it fine and the shakes have been yummy so far. Not any more hungry than I was before starting the diet, so that's good! Peeing for Britain at the moment, but that's a good sign and feeling a bit tired today but that could be a number of things and not necessarily CS.
I'm petite too, 5ft, but only looking to go down to 9st (bmi 24/25, so 2 stone loss for me), it's the weight I was in my early 20s, before kids etc., and I was a happy size 10-12. I can't imagine being 7s 10lb, which is still a healthy weight for our height, but who knows, maybe one day I'll get below 9s - I just need to see what I look like at that weight then decide to stick or lose a bit more!
Good luck in losing the 3 stone, we're all here to spur you on and help each other - keep us posted hun x