Replace driver and front passenger seat covers

Hi. I am taking over my wifes 2005 Altima sedan. The seat covers are really bad, spilled coffee, food, stains, etc. My question: is replacing the seat covers something I can do? I'm fairly handy. I'm concerned about the airbag sensors in the seats. And , if I can do this myself, how do I proceed?

I'll probably order replacement covers on-line. Are there any other parts I need for this job? I'm only doing the two front seats.

Thanks

Paul