OK - some stuff about measuring your progress
We'll start with weighing:
WEIGHING FREQUENCY
How often you weigh is entirely up to you - a lot of us find that daily weighing keeps us on the straight and narrow, but you do need to be able to cope (psychologically) with the fact that your weight fluctuates naturally day-by-day.
WHEN TO WEIGH
First thing in the morning, naked and after you've been the the loo! If you weight later in the day, all you're doing is including the weight of anything you've eaten and/or drunk.
WHAT WEIGHT TO RECORD?
Various options here:
a) weigh on Monday and record that morning's weight
b) weigh every day and take an average to record on Monday
c) weigh every day and record the lowest weight of the week
or
d) start at 100, and deduct a point for every pound lost, if you don't want to enter your actual weight on the spreadsheet
OTHER WAYS TO MEASURE YOUR PROGRESS
It's not always helpful to use the scales - although it's the most obvious way that people use to monitor their weight loss. But it's a fact that sometimes you know you're changing shape (clothes are fitting better, for example) but the scales don't reflect that.
So there are two other things that you can do - first, take your key measurements (hips, waist, bust, upper thigh, upper arm) and measure yourself each week.
Or, find an item of clothing that doesn't quite fit yet (like the photos @VeryLittleOwl has posted) and try them on each Monday. You don't have to take photos of yourself, but as clothes start to fit/fit better, it's a really rewarding way to see that it's all working for you.