The fitter while assessing the shape of your feet and legs will also look at the amount of flex you have in the ankle. This will help him determin what requirements your body has. From there your shin length, height, weight and skiing will be taken into account.
In terms of what you should expect, expect to flex the boots about 15% more in the shop then on the mountain. So if they feel just a bit soft they are prob good. But if try feel too stiff in the shop they are only getting stiffer when cold.
Boots will also feel stiffer without footbeds. Once you have your foot aligned in the boot using a footbed you will find that your leg flex matchs the boot an you will flex the boots easier. Footbeds also massively help with shin problems as they are aligning your leg to the cuff by aligning your foot.
Lastly make sure you are in the right size. It's always tempting to go slightly bigger but it's honestly the worse thing you can do. A boot to big will cause problems. This season I had the chance to ski in the exact same boot but in two sizes. I was at a test and needed some boots to wear. I wear waymaker 130's an the rep had some but a size bigger then I wear. I went with them and used my normal footbeds. They killed my shins, so so painful. The next day there was. Pair in my size, same footbed and the boot was perfect. All it was, was me wearing one size to big. So make sure you get she'll fitted and don't buy big.
And just as a very general guide. I would say 70-80 is beginners or kids. 90-110 is the majority if skiers, 120-130 for aggressive or bigger skiers. That is a very rough guide but is what I have generally found over the years.
