Like already mentioned installing aftermarket lights isn’t all that difficult. Since this seems to be the first time (we’ve all had our first time moments) you’ve done this it can seem a bit intimidating but not to worry. Just remember to hook up the power source for your lights to the battery and not spliced into the JK’s electrical system.
The hard part, if you can call it that, is routing the wires in such a way as to not look like a hack job and the location for the switch inside the cab. Just take your time and think it through. After your install is finished and your lights turn on for the first time you’ll feel like a pro and never worry about future installs again.
Also already mentioned is the fact that in the light kit you buy there will be directions to follow as far as the wiring. For the most part a relay should be included and have wires already attached, again with instructions as to where they go.