We are actually in the process now of doing a complete install and overview video of the Timing Chain Kit install on a 2011 Range Rover Full Size vehicle with our master technician. Video should be ready for viewing sometime late next week.
The LR4 uses the same timing chain kit and tools, so process will be very similar. This is the
Kit and this is the
Tool Set needed.
The video will include the replacement of the water pump as well as some other ancillary parts that are usually ready for replacement as well when the timing chain is and that you want to replace when everything is taken down and disassembled.
As others have stated, it's a bear of a job and not something we are recommending for the DIY'er, but the video should give those contemplating it the info they need to decide if they want to do it.
I will advise here once the video is up and posted.
Cheers!