Simply learn yourself.
For airport-extreme

How to Install AirPort Extreme

AirPort Extreme Base Station is an Apple product is an Internet router. It enables users to share internet connection among various users. The device can be installed on many PC be it using Windows or Mac OS X. You can also install airport extreme by yourself; just follow these instructions.

Connect the airport base with the power station by using supplied AC power adapter. The router will automatically turned ON when you connect it with power.

Now connect the AirPort Extreme Base station to DSL modem. Right after, wait for the Mac to recognize the Base Station. Once it gets connected, AirPort automatically get connected and display.

Check on the ‘update firmware’ if AirPort Utility asks to update your software, then ensures you update it by clicking on “Continue.”
Now name the router and create the password.

Pick ‘I want to create a new wireless network’, then ‘continue’ and give name of a wireless network, also pick the country name from menu.
Select continue and then ‘WPA2 Personal’, again creates a password and click ‘continue’.

Now verify ‘bridge mode’ and using DHCP. After that click on update and then Quit.