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.
A 2/0 hook is a better choice than a heavy, bulky 6/0 size. Circle hooks are beginning to find great favor among the best fluke anglers and charter skippers. With these hooks, all you need is a slow, gentle lift of your rod tip to make the line come tight and hook nearly every fish that sniffs the bait.