Anxiety doesn't necessarily cause concentration problems as its own symptom. In fact, it could be argued that anxiety actually improves concentration. Anxiety is the activation of your fight or flight system, which is meant to keep you safe from harm by ensuring you're running away or fighting without distraction.
The first set up is a standard 20-25 pound test rig (depending on the size of the tuna) with a size 1 to 2/0 hook depending on bait size and the size of the tuna. Fluorocarbon leader can be super effective if the fish are touchy (biting infrequently). This set up will be the primary bait fishing set up.
Many anglers want to target larger scup so they wait until they feel a larger thump and then set the hook. You want to be able to feel the bite so a light-action fishing rod (6 to 7 feet) with a spinning reel is fine. I like to use 30-pound test braid line with a monofilament leader. Fluorocarbon is not necessary.