a hip roof is not really much of a do it yourself job. If you dont work with roof angles much or even at all then this would be a difficult task. Roofs work off of 90 deg angles. You got seat cut, plumb cuts, rise, hip cuts, birds mouth cuts, etc. I'm trying to remember since its been 10 yrs since I did one but I think the ridge board is a 1/3 of the lenght of the building. The rest is hard to explain (type) without showing you hands on. If you do decide to do it then get a speed square-a little triangle tool, and the adjustable big triangle thing. Those are a must. If you can read and understand what the book says then you are a better man then me.

It would be cheaper-time and material- to get a set of trusses made. Should be about $50 tops for one truss. They also make hip trusses.
