The Laramie, instead of being a true repro of the later Model 3 S&W, is a mix, with the Model 3 grip shape and a Russian cylinder retainer. Uberti doesn't want to waste tooling. You need the disassembly instructions for the Navy Arms or Uberti Russian.
Just as the Russian uses the Schofield ejector system and extractor release, the Laramie is a mix of all three.
Joss House has the disassembly method correct.
To be correct, the laramie should only require the latch to be lifted to release the cylinder by rotating the cylinder CCW while pulling it to the rear.