Well if you have decided that your going to Europe here are some handy tips to consider before going.
1) One very important tip is plan your trip months before so you could have everything you wanted like good airplane seats and trust me your going to want good one because the trip is long, also research different prices of tickets, hotels, cars, etc, so when the day comes everything can go has planed.
2)Get a good map so you won't get lost and can have a idea how is the place, also don't be shy when asking people there for directions because Europeans are very nice and helpful.
3)If you have medication bring them with you. And to make sure everything goes right bring medications that could last you longer then the time that you are going to stay in Europe just in case.
4)Bring every document necessary like license, passport, etc. Also always try to have a visa because you never know when you are not going to have money on you.
5) And the last tip and one of the most important is to have a great time and bring a digital camera with you.