Glad to hear you are getting off! I am myself planning my next walk, sometime in late April-ish.
I have many Caminos under my belt (69 yrs old soon), so I am quite relaxed, but I can still remember my excitement back in 2009, lying in my bed in the Pamplona albergue, and for some reason whispering to myself "Thank you, God, I am ready to go!".
Have no fear: You will be surprised how well it all will work out. You are starting out in unchartered territory, but you will soon get the hang of it:
: All is new! How far can I walk? Is there food/drink on the way? Will I be all by myself? Will I find a bed?
: You are stronger: Walking is easy. You are confident enough to visit the (frequent) cafes for a coffee, or a cold beer in the warmth. Fixing a bed is unproblematic. You understand how things work. You know it's perfectly doable. You have most likely met people who walk at same pace, so each time you see them, they are old friends to you, and you share a hug/beer/meal, and exchange experiences. Some of them may become your dear friends for life, even if separated by oceans. You may decide to make a communal dinner with them in the albergue kitchen.
From then on, you're your own boss, and you will handle anything.
: You stumble upon other firsttimers, and help them fixing blisters, beds ahead, etc. You have entered "zen" mode, and you simply walk, eat, sleep, repeat. You are a "professional".
Be humble and open to others. "Do to others what you want others to do to you". Give, and you will receive more than you give. It almost never fails. Most people are worth joining, and a**holes you (may/may not) encounter, will eventually get what they deserve, anyway.
Don't rush it: Many pilgrims have their worst day when entering Santiago, realising that their walk/adventure is over... Remember: The Way is the goal.
: Start planning for the next one, sitting in your TV chair... Stay low about it towards your wife: I am for now...