Rest assured, you are NOT the only one with jitters who is a first-time traveller to Europe. Ideas for your husband? Well, he will get there (to Roncesvalles) early and have some time to rest a bit. I might recommend that he starts off later in the day, so he can enjoy time in lovely SJPDP rather than the much smaller Roncesvalles.
He could walk you to your starting point, and continue with you for a ways, and then hug you goodbye. He could even walk you to the albergue, if he is able to do some hard exercise. It is a steep uphill for the first five kilometers, for sure! If he can not walk up the hill, he could take a taxi to the albergue / restaurant about an hour after YOU start walking, and he could enjoy a coffee, beer, or a bite to eat with you?
Have you looked into staying the first night at Orisson, rather than going to Roncesvalles the first day? I'm not sure how fit and/or confident you feel, but really, the friends I met at Orisson have become part of my friends for life group. It is a good bonding place. Will he walk at all, or will he just be using transportation? If he is going to be doing SOME of the walking, while that first couple hours to Orisson are a bit grueling, he could do that---and then stay at Orisson and take the transportation from there (you could arrange a taxi for him for the next day. Just a thought!
If you go up the other way, I'm sure you could do something similar. Lots of fun things to think about. Do NOT imagine that you are the only first-time traveller to Europe--particularly if you are coming from far, far away (USA, Canada, anywhere with a flight longer than twelve hours or so). It's grueling to travel that far and spend that much to make your way to a starting point. Just revel in the excitement of this being your first time to Europe, and take it all in!