I would suggest using three concurrent methods to track progress:
1) Buy scale - Measure, every so often in the same condition. I measure upon waking, after using the bathroom.
2) Buy Calipers, they are $10 and proficiency is easily obtained at measuring problem areas like suprailiac or abs in a few months. Just keep track of change in mm to monitor fat loss progress. The key to getting good is measuring daily, but don't get depressed won't notice a signifcant change from day-to-day (to many factors come into play), I usually monitor a 5-day rolling average.
3) Take pictures weekly, when you look in the mirror you won't get a full look at yourself, plus the mirror greatly over/under estimates body condition as it pertains to holding water.