We watch the growth stages in flower. When it reaches a mature stage, then we look closer at the trichomes (some of us). Until the stages are complete, even if we see amber somewhere we dont get concerned with it.
At a mature stage and with some amber trichomes, you got yourself a proper harvest window.
All you need to do is research both of these -- stages of flowering, and then trichome maturation. Then, find a "is it done" thread and read a few dozen pages. It will become very easy once you learn the basics.
Your plant wont be dying anytime soon brother. That little tank will take way more abuse then you are offering! You are doing well just let the comments sink in and understand that WE understand what you want, and are guiding you to it.