its very easy to do. just make sure you have some wd40 and some other type of lubricant to loosen some of the rusted bolts. it also helps to have 2 sets of hands but you said you and your friend were doing it so thats not a problem. the hardest bolts to loosen are going to be the ones near the catalytic convertor, or atleast thats how it was on my car. just jack the car up in the front and you should have enough space to work. its hard to say how long it will take you b/c it all depends on how rusted the bolts are. the hardest part is taking it off, which isn't very hard at all, but puting the new system on is very easy.