Hello Pat
Sorry for your loss. I was in the same position a few years and began travelling with Just You. I am sure you will find you have made the right decision and I fully understand your apprehension.
I am not doing this particular holiday, but I noticed no-one had responded to your post yet. Don't be put off - lots of Just You travellers read the Forum but don't actually post.
You will be able to identify your fellow-travellers at the airport (look for Just You luggage labels on hand luggage) so just say hello and you will find that having all chosen the same holiday, you immediately have something in common with everyone and therefore lots to talk about.
Perhaps you will post again on your return and let us all know how it went.