You look incredible and that bit about picking out clothes instead of hiding your body resonates hard. Just starting back up 4 months postpartum, 5'10, 235. Can't wait to wear whatever I want. Goal is back to 170.
Coughing is a great idea. Haven't tried IM yet but thinking about it for other stuff. For sub-q, visualizing the needle entry point as 0.5 inch under skin instead of the surface helps. Goes in with barely any effort this way.
NAD can definitely have concentration differences. Warming it before injection helps a ton. If you're pinning frequently and getting lumps, spreading doses across more injection sites might help absorption and let tissue recover between shots.