Hi Mad, I've done the same quite a few times, and here's what I've learned:
1. Don't look at leaves; look at the buds. I see your pictures focused on leaves.
2. You will get used to looking at trichomes, and even though any decent loupe will be hard to focus, you still get used to it and you will eventually be able to distinguish between clear and bulging, milky trichome heads.
3. Get a good loupe. Crappy ones were a waste of my money in my experience. Here's my favorite loupe, can't be beat:
https://forum.growweedeasy.com/forum...chomes-clearly
4. Look at the bud
holistically: it's more than just trichomes you want to look at. You will see the stigmas (or pistils) turn color and start to curl; you want to wait till they are really curled in, like dried out. There should be very few white stigmas on the bud (some strains will keep throwing out stigmas in a last ditch effort to get pollinated, but when most of the stigmas are dried and dark, it's a good sign.
5. I inevitably brush against some buds when I'm tying something up or moving it into the light; those places will show amber trichomes early cuz the trichomes have been messed with. Try to examine buds that haven't been touched.
6. Practice really does make perfect. I have very closely watched my buds develop and I'm getting used to what they do, and know much better now what I'm looking for. Keep using the loupe: it really does help to practice.