Just want to (a) second sunny jim's advice here, but (b) add as well, a 10-100x pocket microscope is so much easier to check your trichs with...also there is a matter of preference for when to harvest when going by trich color; If I remember correctly the 10-30% amber trichs mark is where most people harvest (amber coloration being a sign that the trichome heads are starting their degradation) but that doesn't mean some people don't harvest earlier with more clear trich heads for more soaring highs, or that some peopel wait until a greater percentage go amber...so, IMO, stick with the rules of thumb you dig up (esp. in the harvest/cure forum) and try a few grows abiding by those, then start tweaking shit...if you journal everything every grow you'll be able to figure out what YOU want out of YOUR BUD, and know how to get it.
Be easy,
Dr.J