The system is extremely easy to put together. Nevertheless, you will have to remove the mainboard from the system case before you start. You need it to insert the water block retention spindles around the processor socket through the holes in the mainboard PCB:
Then you install the backplate with soft padding on the bottom of the board. And after that all you need to do is place the water block onto the spindles and tighten it up using shaped crew nuts with washers:
Note that the LGA 775 platform allows turning the water block in any direction as the installation manual doesn’t mention any preferred positioning of the water block on top of the CPU.
Don’t be surprised to see two different mainboards on the photos above. The thing is that Thermaltake Big Water 760i was tested on two different platforms, so this is where the differences come from.