I've yearned to free myself from barber shops and cut my own hair for years. Always afraid I screw up.
I just found the Remington Shortcut. I picked it up for Amazon, $32 shipped and just tried it today. Works beautifully gives a great even cut up to 1/2". Not sure how accurate the setting wheel is but they tell you to start with the longest setting and adjust. It also has something called a balding comb for those of you who don't mess around.
Like it says on the box, you can't screw this up!
Have no idea how long it will last but it is highly recommended for an easy short cut.
http://www.remingtonshortcut.com/#/home/ is also available from Kohls and Target.