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.
If larger tuna and multiple species of tuna such as bluefin tuna or yellowfin tuna are mixed in with albacore tuna or in the same general area or larger tuna of the same species are mixed in with smaller tuna, it is a good idea to have a heavier set up.