First of ALL you need to have both sides of the rear axle at the same plane...
IF not then the anti-sway bar will put a lot of load on the control arms.

Put jack stands under both lower control arms.

2) that is the toe-link & that end is like a tie rod end..either a special puller OR smacking the part of the hub where that goes in.

3) I always remove the axle first.

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