Should I buy a torque wrench?

Im a novice with car maintenance and repairs. I know how to change a tire, but Ive heard different opinions on whether or not a tire iron will do the trick, or if I should go with a torque wrench for tightening the lug nuts. Would appreciate feedback.Edit: My post was very poorly worded. I realize that a torque wrench is only used for tightening. via /r/cars http://ift.tt/2sNbhHl