I just redid my front seats on my 77 Targa. It was my first time attempting anything like this, and although I won't say it was easy, it was achievable with some patience. I also found it really helpful to have a helper (thanks Alex) as there are times when one person can be applying pressure while the other person uses the hog ring pliers. I ended up doing one of the seats a couple times until it was just right. There are a few videos online that were helpful as well. I would feel confident doing it again. Make sure the covers you order are high quality and the correct fit for your seats. I chose vinyl and I have been pretty happy with the results,
Jon