its not hard at all! the only difficult part for me was the blood @_@ but basically its just a normal outfit with duct tape (make sure the tape is loose when you put it on, not tight!)
The blood i made at first was a mixture with light corn syrup. WAY too sticky. If your not afraid of stains, go for red food coloring. if you want it a bit darker, add a few drops of blue and you have good, edible blood! ^^ the stains come out after about 1 month (or 2). Good luck cosplaying, and if you have any more questions, I'm here to answer