Don't let that scare you away.  We desperately need more GMs.  That was just a big table of numbers.  I will do it for you too at the end, if you desire.  We even have a downloadable excel sheet that will do 95% of the work for you.  All that is really needed is finish dates for fights, the CR# of the encounter.  The rest is just crunching numbers.  It is easy for me because I have done a dozen of them, all by hand.  
The focus of the GM should be on carrying a good story description and flow of the game.  A group entering a room should see about a paragraph of emersive description of a room and its contents.  I admittedly slip a little in that category, but make up with good maps made in MapTool.  So, please don't shy away from running a game.  Three games are finishing out this week.  It looks like in the next two weeks we will have around 25 active characters in the DWI waiting for a game and 1-3 GMs available to run them.  We could definitely use more GMs.  A first or third level adventure is easy to start with.  It can be a short one, just a couple of encounters.  Just something to keep people from getting bored and having to waits months before getting back into a game.
Please! Please! Please!!!