Strip your cable. Use your cable strippers at about 1-2 inches from the end of the cable to remove the outer jacket.
Untwist the twisted pair wires all the way back to the jacket. This can be done just like a regular twist-tie on a loaf of bread, but with four of them of different colors.
Align the untwisted wires in the order necessary for your needs. For this scenario, you'll be making a straight-through cable, which has both ends of the cable with the same alignment of wires, so it's easy enough to do. Since this is your first cable, we'll consult the cheat sheet to know what order we're aligning in!
Cut the extra wire. Once you've untwisted the wires, you'll have a superfluous amount of copper wiring left; we don't need this much, but it's good to have it in the previous step to help in aligning the colors properly. Use the wire-cutting scissors to cut these off.
Push the remaining wires into the RJ45 head. Be careful not to bend the wires while pushing them in or you run the risk of creating a bad cable. You also don't want too little or too much wire left in the head; there's no definite length necessary, but it's pretty obvious to tell if there's too much cable or not enough. A short length of the jacket should be up the RJ45 head; use this knowledge as a reference.
Double-check that the wires are all the way up into the gold pins of the head and made it up in the proper order. (Consult your cheat sheet if needed!)
Push the head into the open space of the crimping tool and squeeze it closed, hard. If you don't crimp the cable all the way, the head may come off.
Open the crimping tool and remove your newly-crimped Ethernet connector.
Repeat the crimping process on the other side of the cable if you're making a completely new cable. If you're repairing one end, this won't apply to you, so move on.
Plug one end of the cable into the tan, two-port end of the cable tester, and the other end into the other part of the tester with the graphic display window. Turn it on and listen for the beep. If it beeps once, you successfully made an Ethernet cable; if it beeps twice, some part of the cable is messed up and needs repairing. Depending on the error, the cable may or may not still be usable.
Plug your Ethernet cable in. Now that you've made an Ethernet cable all by yourself, you can connect all kinds of devices together! Of course, for the cable you just made, make sure they're different devices! You can connect to Xbox Live now, to Playstation Network, to your wireless router, and many more devices you don't even know about! Or, if you're known as the life of the party, you can show off to your friends and never have to worry about being invited to another party again... !
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