Attached is a LGC plot of Mira variable U CAP, which was in "need of more observations" over a year ago. My observations have been highlighted with a "cross." By just taking one image every 7 to 10 days, the minimum and and maximum have been easily identified. I also observe R AND, X AND, X AQL, U CAS, S CET, Z LYR and other Miras in a similiar fashion. Consider taking CCD images of select Miras on occassion to help in monitoring their long term behavior. Kevin Paxson - PKV
Links:
[1] http://www.aavso.org/forums/variable-star-observing/photometry