@bwyatt,
Spring is Spring - so go ahead and prune.
Remove any dead branches, cutting down to the crown.
Take off any branches rubbing another or growing sideways. Take out any center crowding branches to air out the bush. Prune down all others to to shape. Cut on slants down to each swollen or bud, just above the bud so the rain runs away from the bud.
Knockouts are very hardy. Just fertilizer with something like Rosetone, and water often.
That’s what I do, anyway.