If YOU are doing the work, doing both hinges is about $20 and one is $10, can you afford that?
Really, these bushings are cheap, if you are going to pull the door off to do one, do them both.
You are probably going to need to align the window when you are done too.
You can possibly align the door to the worn part of the hinge. Yes this is hack, but if you need to just get by a while. If it's the top one that is worn the most, loosen it to the cowl and lift the door up so the hinge moves forward on the cowl. If the the lower hinge is the worse one (or you may need to do both) then loosen the bottom one on the cowl and lift the door which will move the hinge back which will raise the back of the door.
Like I said this is hack, as you still will have worn hinges but it may get you buy a little while if you are in a pinch. It may be hack but if you really can't get to it, aligning it to fit the worn hinges is a lot better than slamming it shut all the time and ruining the latch and striker. Or worse yet busting the metal around the striker which is very common when someone slams those doors shut because of worn hinges.