Research the rules, regulations and legalities of your trip-- especially international travel. Make a checklist of what you may need: a passport, alternative ID or refugee card, for example. If your destination requires a visa, look up the technicalities. A visa for Brazil (if you hold an American passport), for instance, states that a first time visitor must use it within 30 days of applying, otherwise it's void. Countries also often require proof of immunization records.
Take advantage of Lufthansa's home check-in system. According to the official website, passengers are allowed to check in at home as early as 23 hours in advance, enabling you to choose an available seat-- saving you a spot in case the airline is overbooked.
Investigate Lufthansa's baggage policy. Luggage regulations vary depending on class of service, destination and inter-airline connections. For flights to Europe, bags are allowed to be up to 88 pounds for First class, 66 pounds for Business class, and 44 pounds for economy. It's important to measure the size and weight of the packed suitcase--this is the culprit of many long lines and pre-boarding troubles. The easiest way to get the exact weight is to note your own weight, stand on the scale holding your bag in your hands then subtract your weight from that of you and the suitcase.
Also, be sure to look into specific embargo allowances between your country of origin and the destination.
Check the condition of the bag. If the suitcase is very beat up, has holes or tears, there is a good chance the agent will make you sign a release of liability. By doing this, any possible damaged or missing articles are not accounted for, and you will not be compensated if additional harm is done to the luggage. If there are major physical flaws in the suitcase, you may not be allowed to check it. Inspect your bag; if you question whether it can handle the trip, invest in a new one.
Identify the particular gate you'll be boarding at. Departure gates often change, and your original gate might be moved without you noticing or hearing about it. Lufthansa has an automated system that lists scheduled flights on a screen. Check periodically to be sure your flight has not moved. Then you're right on your way-- up, up and away.