A bow scale and press is needed. Also , I reccomend everyone take a picture of thier cams when thier bow is new to check for timing and changes.

Before starting, take measurements of everything. brace height, Axle to Axle, bow wieght at peak, and full draw and note the positon of the cams with the limbs.

Then only change one cable or string at a time. Some bows have two cables. When you take strings/cables off, measure the lengths and measrue them with alot of pressure, and try to get your new cable/string, the same length by twisting. Do one thing at a time. Afterwards, match your bow weight, and twist the cables to increase and untwist string to decrease. Adjust the cables/string twist for proper timing. Shoot around 50-100 shots to settle in, and recheck everything.