Hi IDB
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For the beginning it can be really helpful to use a loupe or a small microscope to check the trichomes.
Especially later in bloom, that’s the most reliable way to know when your plant is ready. Personally, if I’m not taking photos, I use a simple handheld loupe like this one
https://www.cannasseurclub.de/products/trichomen-lupe?srsltid=AfmBOoq7_442zWOtkjLDaS-LjXFnTebVaY3cv9qhPWaGVsQqUIbnbkQn
Happy Growing 😊