Hi Hitch;
Maybe you could try with a video instead of a .pdf. Right now I don't remember their names but there are programs that record the screen of your PC while you are working in it. And you can add voice to that video so your clients will know what they need to do. Come on Hitch, all of us sometime we've seen a tutorial in youtube about how to do something 

 Do one of those videos.
Regards
Rubén
EDIT: You could use 
OBS; it's free.