in about six weeks try taking a magnifying glass and stick it in front of your digital camera. this will allow you to pretty easily take photos of the trichomes for examination. it depends on how you like your experience, but the general rules of thumb are:

clear trichomes: cerebral feeling
cloudy/milky: mix of cerebral and body feeling
amber: couch lock incapacitation/munchies kind of feelings

theres a pretty good chart somewhere on this site about it. all you have to do is pick your favorite feeling and wait for the trichomes to turn that color and theyll be ready.