If you want to paint a big picture, you have to start small. I believe in systems; behavior, patterns, routines. These dictate the realities we accept and live by. You can adjust your systems, and you should, just like you would with any other machine. You service your car regularly and you update your iPhone software regularly- treat your habits the same way. Solidify what works, and discard or change what doesn’t.
When faced with a new opportunity, the unknown is the scary part. That’s fear. Notice it, accept it, and then do it anyway. You won’t REALLY know unless you do it. You’re not going to be an expert the first time you do anything. But, your attitude is a choice. Always. Respond, don’t react. Learning to take situations in stride and control how you approach them is a skill that gets better the more you practice.