You'll find lovers and haters of the LG on here... personally I've had good luck with it. Some gal wrote a great 'how to', if you do a search for Little Giant Incubator it should come up.
From experience:
Throw away the thermometer it came with. Get a water-wiggler or have a temperature probe at egg level.
Be sure to have it in a room with little temperature variation - right now mine is in my parent's basement.
Get it up and running a week before you put eggs in it. It takes awhile to stabilize.
Filling the bottom with rocks, pebbles, glass beads, etc (as a 'heat sink') - will help with temp swings.
Dry incubation is your friend
Turn the knob a HAIR, then WAIT!
Watch for a temp decrease when you take out the auto-turner.
That's all I can think of for now!
Good luck!