So sorry to hear about losing your husband.
It is wonderful for you to continue your dream in his honor, memory and to continue your healing.
I will be a contrarian and advise you not to read a lot of books or watch videos about people's experiences on the Camino. Your Camino should be your journey without previous influence of the experiences of others.
Mostly I would suggest getting into the best physical shape you can, researching gear and deciding what's best for you.
I agree 100% with this advice. But you have already watched tons of stuff do not let it cloud your perceptions or introduce what a camino "should or may" be for you. It is your own and let things just unfold for you.
Everyone has fears and misgivings before your first camino. I have a few and I have walked 6,000 kilometers over 6 caminos. I am preparing for number 7 and I have doubts. Don't concern yourself as a fear and doubt you have on day 1, 2 or 3 that has been building for weeks and months will magically disappear by day 4 or 5. You will laugh about them.
Make sure you have good shoes that will not cause blisters. Personally I use trail runners. Unless you have a specific issue that requires boots or you have tried and true light boots that you love and have worn for months, boots are not needed on caminos. I have walked alot of different ones.
Get a good fitting pack and remember unless you absolutely need something don't take it. You are not in the Sahara or trekking on the Pacific Crest Trail and days away from civilization. You can buy EVERYTHING you may need.
For advice on packs and footwear check out posts by
@davebugg he is an invaluable and super knowledgeable resource.
Get quick dry clothes and smartwool socks. If you are traveling in late spring to early fall. You could get by with just a silk sleep sack. If you need a sleeping bag get a small light one.
Can't decide if you want to walk with someone. It is your camino and it may be better to do it alone. If you are doing the
Camino Frances you will meet lots of people. I have made life long friends I have met in the albergue I started in SJPP, and Irun. Before I took my first step. If you are starting in St. Jean there are lots of wonderful albergues to sleep in. I would recommend Belaire. I guarantee you will meet some wonderful people who you can help relieve you of your first day jitters and maybe meet that friend for life.
InformaciĂłn del albergue de peregrinos GĂ®te d'Ă©tape Beilari, en Saint-Jean-Pied-de-Port / Donibane Garazi: Precio, plazas, caracterĂsticas, etc...
www.gronze.com
Remember the lesson that Don Juan taught Carlos Castaneda. Everyone has fear, but warriors are not afraid of being afraid.