there is no easy way to do either, i'll tell you that right now. and neither one is any more unsafe than the other since you are essentially creating a turbo harness out of your nt by adding a few wires.
if you decide to keep and modify your nt harness (most do it seems) then all the instructions are up above.
if you decide to swap in a turbo wiring harness prepare to remove your entire dash and some of your heating equipment to get to it. not impossible, but no fun if you've never done it before.