[Steeveedee]

You can do the lowers either way, but leave stuff off until you get them tight, because you're going to need the room. The replacement torque is 130 Lb-Ft, and while it is a one-arm operation, it's better to have it on the truck instead of standing on the control arm. It gets pretty wobbly off the truck, having to stand on it. And yes, they tighten into the lower control arm. That interface is where the torque is developed against.

Edit to add- they should be up against the lower control arm before you install the the lower control arm, so that the alignment pin is in the correct position. Final torque is only going to be a small part of a turn.