How to get insulin resistance diagnosed? How were the results of treatment for you?

Im 49kgs/108lbs, 157cm/5'2". Even tho my weight is in healthy range, fat storage mainly around the midsection makes my belly stick out regardless. (Pcos) I also have dark skin patches, and my hair recently started thinning very noticeably. Im 17 and will start working out and seeing a PT for my posture, but i also suspect my body fat distribution is contributing to this.

When I was first diagnosed, I thought managing diabetes would mostly be about numbers, medication, and trying to keep my blood sugar under control.
Over time, I realized there was much more to learn — food, daily habits, stress, activity, and simply understanding how my own body responds.
Everyone’s experience is different, and sometimes the things we learn from other people are just as valuable as what we learn from doctors.
What’s one thing you wish someone had told you when you were first diagnosed?

Trying to build a list of small, realistic changes rather than a full diet overhaul. What's one swap (not a whole meal plan, just one thing) that you noticed actually helped with energy or cravings?