Installing seat covers is not as hard as you think. A set of hog ring pliers and some new hog rings is all you really need along with another set of hands to help stretch the covers to get them tight. You have to remove the seats to do it and one trick I learned over the years is to do it on a hot sunny day, let the new covers set outside in the sun to get warm and softer, it makes stretching them a bit easier. You can do the whole car in about 8-12 hours if you do not have to much trouble removing the seats. Ours do not look that hard. Make sure you pull the fuses for the air bags if you are going to do it though, just to make sure you do not fire off the air bags by accident. Also after that disconnect the battery.
The rear seat are so much easier than the front seats too.