follow your shock down to the bottom and theres two nuts take those nuts off, once that is done, under the hood your going to need a small wrench to use for the very top of the shock so it doesnt spin and then another wrench for the actual nut, remove the nut, once that it done remove the three nuts on the shock bracket on top of the shock tower. remove the shock bracket and remove the shock reverse steps to install!
chilton has a really good book for 64-73 mustangs for 24 bucks it's well worth it hope i was some help!