Haven't got an XRay myself, but I dont think it's harder to assemble, than shocks on other cars.
You have the option of assembling it as an adjustable or non-adjustable (traditional TC) shock.
Usually, manuals are quite good, and with the usual XRay quality, the manual is probably even better.
By the way, here's an excellent XRay setup guide. It also explain about the shocks. XRay setup guide