Hi Mark,
It didn't take you long to get them delivered !
If you have gone with the same length shocks as the stockers you can change them one at a time. If you have gone for shorter or longer shocks both the OEM shocks will have to be removed before you can install the 440's
If I recall when I done mine the stockers came off fairly easily with only gentle persuasion from a rubber mallet being required. (Whilst the bike was on the motorcycle lift, high enough to get the back tire off the floor I also had ratchet tie downs from the handlebars up to a roof joist)
I'm pretty sure Pig9r is correct and the sleeves stay in the box.
Such is my memory these days I can't help you with the correct torque setting for the fasteners
Good luck
Tony