Mechanically speaking, this is about a mid level task. HOWEVER, as mentioned by others, it's the tools, or more to the point, THE LACK OF the proper tools that will bust you on this. You need a 1/2" impact with and as TC put it " a couple of big assed sockets " Driving a 1/2" impact with one of those little bitty Sears compressors is a stretch, so if you don't have the the compressor, don't go buy the impact. Harbor Freight sells air tools cheap that hold up well enough under occasional use. They also sell Campbell/Hausfield compressors for very reasonable prices, but by the time you've bought everything you need if you don't already have it, you're a grand in the hole and still waiting to do the work. Bottom line, find someone to do this for you if you don't have the right tools.