2014 Buick LaCrosse Leather W/Performance Suspension Lower Ball Joint Replacement Instructional Video

They only service the ball joint along with the lower control arm FYI. Check out the images (below). Let us know how it goes.

That looks like the somewhat rare GNB suspension option package. That technically isn't a ball joint, it is a rotary joint. That is a really strange suspension as the vertical travel and steering direction are separated. You have the upper and lower A arms that only pivot with the knuckle attached. The steering is done through the two knuckle pivots that bolt to it The lower one is the one you are trying to change. They bolt into place and slide into the hole in the steering knuckle. The problem is that in order to do that you have to remove the steering knuckle yoke from the vehicle as the bolt is a captive one due to the axle being in the way. As such you have to remove the strut cartridge from the yoke, disconnect the speed sensor, remove the axle nut and be sure the axle can slide in the hub. Next remove the lower bolt that goes through the A arm bushing. Now you need to slide the hub off the axle and down off the strut. Now with it off you can replace the upper and lower yoke pivot assemblies (You have to take it apart for each of them so I would replace both while you have it apart). Then you reverse the process. In theory you don't need an alignment either as the parts are held in place with press fit bolts.
I don't know of any videos on the process, I've only seen one car with it being worked on.