I learned by drawing and taking pics of the bow and how the cables are routed. You also have to get the cables and string on the correct way..the serving is short on one side and long on the other (pay out and take up).
Tips......
Pics and drawings of how the cable and string route....
Use a pencil on the cams and mark where the limbs cross the cam. This makes it easier to set back EXACTLY as it was before you took the old ones off
Check with Bowtech...they will give you EXACT measurements.
H and M Bowstrings are reasonably priced and VERY nice strings!