Yes, you need a internet connection. No, you don't need LAN drivers when using the bootable tools method to upgrade.
You burn the Linux .iso file to a CD or USB thumb drive, and then boot to the CD or thumb drive and it will automatically detect your internet connection.
1.) Install O/S with only your SSD & CD/DVD drive connected. The SSD should be connected to a native SATA 3 (6Gb/s) port in AHCI mode.
2.) Install your motherboard drivers and graphics card drivers.
3.) Connect any remaining drives.
4.) Run WEI (Windows Experience Index), which will automatically disable defrag on all SSDs it detects.
5.) Update your motherboard’s BIOS to its latest version (if it’s not there already).
6.) Install all of the Windows updates.
7.) Install Intel’s latest AHCI SATA drivers. https://downloadcenter.intel.com/Detail_Desc.aspx?Dwnld...
8.) Update your SSD’s firmware to version 2.25 (if it’s not there already).
9.) Run 1 benchmark test using ATTO and 1 benchmark test using AS-SSD to see if drive is performing close to advertised speeds. http://ocz.com/consumer/download/product-briefs/ssd_ver...