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Stephen Covey talks about the "big rocks" when scheduling.  Here is a YouTube video of a conference he did regarding scheduling.  It's from back in the 90s, I think, but the message is still very relevant.  It talks about scheduling not only business related events, but also personal, fitness, religious, etc.  Check it out:  

http://youtu.be/jI87IEnwh4w?t=53s

How far in advance do you plan out?  What do you use to schedule?  Aside from an electronic calendar, I use a 2-month wall calendar I bought from Staples.  It enables me to forecast and anticipate big items, such as full-day events, both personal (Legoland) and professional (Open House).