Excellent!
I've found the
US Navy's body fat estimate to be reasonably close to my "actual" body fat as determined by Dexa Scans. Bodyfat scales less so...
With the Navy method, measure your waist at your navel with your stomach relaxed and after exhaling. Make sure the tape measure is horizontal - a sagging gut tends to make the tape tilt downward...
I made a quick spread sheet to deal with the declining calorie deficit as you lose weight. If you started tomorrow, you'd lose 15 lbs of fat around April 11 and 25 lb of fat on June 18:
View attachment 41438
You can see that the amount of fat you can lose really slows down as your body has less fat to work with.
So the way to get as close to exact as possible is to weigh out everything. This is pretty much what I do, although at restaurants or at friends' houses you just have to estimate. There are lots of calorie tracking apps - my fitness pal is probably the most common, I use myplate. With packaged foods it is really easy - just scan the barcode with your smartphone from the app and it'll enter all the info for you.
As hard as it is, I would really recommend weighing and counting every calorie for a couple weeks - you'll learn a ton. Studies have shown that when people estimate, they tend to under count by 400 calories (and dieticians - who should know better - under count by about 200 calories). As you go along, you'll learn that the difference between 3 and 4 oz of chicken really isn't that much (40 calories) but the difference between 1 tbsp and 2 of salad dressing might be 90 calories. Many people end up eyeballing their meat (or veggie) weights by comparing it to their palm size.
*With meats, keep in mind that many nutrition labels are based on uncooked weight. A 4 oz hamburger patty will cook down to about 3 oz, but it'll still have pretty much all of the calories - not 75%...
A smartphone app is mostly what I learned on. When the app doesn't have data on something, say yardlong beans, I'll google "yardlong bean nutrition" and usually find data from someplace like fatsecret.com or nutritiondata.self.com
My main advice would be to find some form of exercise you enjoy so it doesn't feel like a chore. Walking, running, biking, rowing, skating, etc - it'll burn calories and the endorphins will improve your mood.
For strength training, I pretty much just search "body weight strength training" on youtube and try to follow along to the various 15-30 minute videos. I also got a pull up bar for my door jam and I keep an extra bag of water softener salt lying around that I use for curls. Push ups, sit ups, planks, air squats, burpees, bicycle kicks, etc are all pretty common exercises I'm doing for now, but I am looking forward to being able to go to a gym.
Multiple chicken breasts probably still have fewer calories than the whole sandwhich. For instance, a "Charbroiled BBQ Chicken Sandwich" from Carl's Jr has about 370 calories. The "low carb" version (wrapped in lettuce instead of in a bun) has 180 calories so you can get two of them and still have 10 fewer calories (plus you'll be getting almost twice as much protein for the calories you are consuming).
Mostly you'll have to find what works for you through trial and error, but the most basic advice I can offer is eat more vegetables. Personally I always hated vegetables until I gave up sugar (just for the empty calories), but after a few weeks I found that I really enjoyed a lot of vegetables. A quick and filling lunch might be a giant bowl of broccoli (about 200 calories) along with 3 oz of left over trip tip steak (about 200 calories). When something calls for 2 eggs (160 calories), I'll use 2 egg whites and 1 whole egg (110 calories). I like chopping up celery and sticking it in random foods to add bulk (and virtually no calories). I also find that if I make something spicy I'm more likely to feel fuller, so I've been adding jalapenos to lots of random meals, mostly with success.
For breakfasts, a lot of the time I'll make a
spinach cottage cheese egg bake for the week and have some each morning.
Overnight oats are another easy & filling one.