I installed the Rock Shox Reverb Stealth and I thought it was fairly easy. The manual will show you how to route the line from the handle bars to the seat post. Once you see the wire or hydraulic tube in my case, you need to grab it and pull it up.
You'll need something like this tool...
Looking at the specs on the Specialized site the seat tube length is 50mm shorter on the LG so most likely it wont fit.
I'm 6'2" with 33 inseam and I thought 170 mm was perfect for me but its too long so I never bring it all the way up.
I haven't tried the shuttle mode yet but it does have the swat tool on the bottle cage.
Not sure if this is the exact item they put on the bike but very similar
Zee Cage II w/ Tool – Right | Specialized.com