Nowadays, Wireless Local Area Networks (WLANs) become a popular solution for networking among computers and other devices within a limited area such as a home, school, computer laboratory, or office building. A WLAN is a wireless network of devices, where two or more devices are connected via wireless links. In this network, users with their devices can able to move around within a coverage area, while they are connected with the network. This WLAN is commonly called as Wifi. Proper deployment of Access Points, Switches, Cables and Connectors and tune between them is the main requirement for efficient and faster communication between computers and devices. To get optimized performance from a WLAN, it is essential to do Site Survey and Radio Frequency (RF) planning before the deployment. In this paper, we present and analyze different techniques of site survey and RF planning. We also suggest a methodology for these, which is needs to be adopted by expert engineers while deploying a WLAN.