I was traveling a lot, but only by train and in summer. I know that it takes a lot of time, but you can have a good sleep there before you’ll visit no end of sights. You’ll have no problems with tickets, because it’s easy to buy them in the Internet or at the railway station nearby from you. In every country there is their own web-site, which you can find easily with, different searching systems. If you buy some tickets within, for example, a month, you can choose the cheapest variant of the most cool class.
It’s comfortable for us, that tickets can be used for 24 hours. That’s why you get more flexibility in your route. You shouldn’t be worry about being tired after that. But there are some pluses in traveling by car. I know, it takes a little more time and a little more powers than traveling by airplane or train, but it gives you more suppleness, for instance, you liked this or that village while you were driving.
You wanted and you stopped and went to see cows you liked. What’s more, you won’t have problems with lots of bags. But you need two or even more drivers, because when you’ll be tired who will drive instead of you?
So, there are lots of ways to choose. It depends on you.