Day 4: a warmth from underneath when you press your hand against your thigh. Not on the skin. Deeper than that. Most people think it's the heat setting and turn it down. It isn't.
Week 1: skin starts to feel less heavy. Not dramatically. More like something that's been tight has settled a little.
Day 10: texture begins to soften. You notice it when you press, before you notice it when you look.
Week 3: this is the one that matters. Someone who sees you regularly says something before you've told them you're trying anything. A sister. A friend. Unprompted.
Week 4: the light switch. Most women describe stopping a bathroom habit they'd had for years, turning the light off before getting undressed, without deciding to. They just stopped.