Pull the door seal off the top of the door to reveal 2 phillips drive screws, this holds the window channel in.
Pull the door trim off, follow the channel down, there is a 10mm head bolt that holds the bottom in.
Wind the window down, take out the 2 screws and 1 bolt, remove channel.
Will be able to remove the 1/4 window now.
At the bottom of the glass there is a metal channel. Held to the window regulator with 2 10mm head bolts. Remove bolts and pull the window out.
Install is a direct reversal of the above.