Two years ago, I moved from NJ outside NYC (where I had lived for 30 years) to Blacksburg, VA (home of Virginia Tech). It was a move from the NYC suburbs to the Blue Ridge Mtns. of western VA. My move was a bit different from yours as we moved for my husband's job at Virginia Tech. He had been commuting here for several years before our move, so he already knew people here. We also found a house in VA before we put our house in NJ on the market, but we had the same crazy/stressful experience of fixing up our NJ house, decluttering our stuff, packing up 21 years of belongings etc.
Although I am your age, I have a high school daughter. We actually moved before selling our NJ house so my daughter could start school. We had to store some of our belongings for a few months and were traveling back and forth 10 hours to get the NJ house ready for market. It was a difficult time. I was sad to be leaving family and lifelong friends behind in the northeast and my daughter hated us for "ripping her from the only home I have ever known". Somehow, we managed to navigate through all the disruption, and I am happy to report that all three of us are very happy here, for many of the reasons that you mention in your post.
Some things that helped me with the transition: Blacksburg has a wonderful Newcomers Club which is made up of women/couples aged thirties to eighties, about half of them our age. There is no time limit on membership and some of the women/couples have been in the club for 20+ years. Notwithstanding this, they are very welcoming to new members! We have a lot of sub groups and I am making some really good new friends. Because of my daughter, I've been volunteering at our high school, but I have met women who are having fun volunteering for different social service community groups. You should see if Llano has a community foundation or other umbrella agency that knows about volunteering opportunities in the area. Finally, our town has a Citizen's Institute which introduces citizens to the various departments of the municipality. The town wants to find citizens who are interested in volunteering on various planning committees/boards etc. It was a very interesting 10 week course (one evening a week) and helped me get to know how things work. I don't know if other towns offer this or not.
One thing you might want to consider while you are living in your hotel and house hunting is joining a local YW/YMCA or community center that has fitness classes/art classes/knitting classes/a swimming pool etc. If you are so inclined, join a church. The local library should also be a good source of information on local activities/classes etc.
There is a great book by Melody Warnick, a resident of Blacksburg about moving and getting to love your new home. It's called "This is Where You Belong, The Art and Science of Loving the Place You Live". This book might help you as you embark on this new journey.
Have faith and follow your heart. It sounds like you are making the move for all the right reasons. i am sure it will all work out!