Thanks, all for your comments, especially about carry on bag size. Already knew about the boarding pass thing and ability to print for both ways before leaving.
Dublin appears to be a good destination, as the airport is only 15 minutes by good, frequent (10-15 minutes apart) public bus service from where we are staying.
Don't intend to eat on this flight, at all.
Am fit and of proper weight, and so hope seats are at least bearable. Have no expectation of flag carrier service or amenities. Just get me there on time and in one piece. Am a very experienced traveler, just never on RyanAir.
Pray for us.