I know most tools, but the new diagnostics still confuse me. Now what?

You call yourself handy. That word is doing a lot of work to protect you. It lets you skip past the plain fact: some buttons on that machine, you have never pressed. Not because they're beyond you. Because you haven't made yourself press them. This is not a knowledge gap. You could learn what those features do in an afternoon, from a manual or a coworker. What's missing is the will to look foolish for one day while you fumble through something new. That's the whole obstacle. Name it correctly and it shrinks. You don't need to master the equipment this week. You need to stop avoiding it this week. Those are different tasks, and only one of them is within your control right now.