And to build upon the previous post.
They are CHEAP insurance. If you are that deep into a project like this already its very simple to do this. Now, I am assuming that you are competant around this type of job and have the the proper tools. (torque wrench). That combined with a Haynes Manual or Ford Service CD and you should be golden. Even better if you have someone else who has done it even once just to make it faster and to instill confidence.