We have a spare tire.
Have an 8 ton jack
Have tire tools
Purchased Road Side Assistance
We would try to change our own tire if possible. If not then we would call road side assistance.
Having a spare along certainly makes me more comfortable even if I have some one else change it. Otherwise you are at the mercy of who ever shows up to change the tire....they may charge more than a tire store would for a replacement tire and you don't have much choice, plus it may take some time to get one that is a close enough match to the other tires, or they may try to sell you multiple tires because of wear on the others and you need to have tires that are matched in size?
Just personal opinion...I would never travel without a spare.