the hub swap isnt hard..
the fronts can be done in a little over an hour. redrill your stock rotors, or swap to stang brake setup (GT PBR's / Cobra PBR etc...)
the rears need the hubs pressed off/on by a machine shop, (change the bearings while your in there, its the PERFECT time)
if you want to run cobra brakes in the back you will need the caliper relocation brackets, which are pretty easy to install.. you will need a grinder of some sort or a sawzall, (there are a couple little ears to take off the stock rear knuckle) ..
its not as bad as it sounds... if you have everything in order and access to a shop that will do the pressing on the spot, it shouldnt take you more than an afternoon...