Let me put it this way, if you have the stock throttle cable slack set at the factory you are guaranteed not to have a problem. If you adjust it yourself best know what you are doing else you risk snapping the throttle cable. If I were going to do this (which I would not) I would research the various instructions and techniques on the internet and then do the best and cleanest job possible.
For a lot of people that's common sense I am just putting it out there, there is a risk which is inversely proportional to your mechanical ability.
I am happy with the way it is set plus you do not need "heel to toe" in an auto.