It is possible to go 'too far'. You can end up with hermis or a high that was not what you intended.
If you don't have a magnifying glass (go get one is my answer but... lol) you can SORTA tell the trich ripeness by a change from 'sparkly' to 'hazy' appearance of the frost on the buds. But it's nowhere near exact, because you can't see the change from milky to amber, which is more subtle.