Hi Dawn
I hope you've taken the plunge and booked, I know how scary that feels but you won't regret it.
I'd advise you to make sure you put one of your luggage labels on your hand luggage, that will help anyone else on the tour to spot you and say hello, Also look out for others with the label and be brave and say hello to them.
There will be a JY rep at the airport, usually somewhere near the check in area, and you can always stay with them until someone else who is also on your tour turns up.
Have a great time whichever trip you choos. I did the Rocky Mountaineer trip in 2018, it's a fabulous country.
Rose