A luxury cruise around the world takes about 4 months. While other passengers get on and off, you remain on board for the entire cruise season, visiting dozens of countries. Although an around-the-world cruise can cost more than $100,000, you will be able to move into your cabin and use it as a home base instead of dealing with crowded airports, flight delays, baggage restrictions and other travel problems that can ruin a trip.

1. Decide what cruise you want to take. Even world cruises won't take you to every possible destination, so you'll have to compare several to choose the ports of call you most want to visit. You should also consider the departure location.

2. Check-out regarding visa requirements. Visa and documentation requirements vary by destination and change from time to time without prior notice. Passengers should check with the consulate of each country they will visit, or a visa service to verify current regulations. It is the passenger's responsibility to have proper travel documentation.

3. Call early to book your passage. You will not be able to get discounts by waiting until the last minute, when the cruise line drops the price in order to fill empty cabins. However, you may see some discount for booking well in advance.

4. Buy insurance to recover your loses in case something comes up and you can't make your cruise. You may not get most of what you paid returned to you, so you'll want to buy trip insurance. You should also check into your medical insurance coverage and buy additional insurance to cover you while you're on your cruise.

5. Do your research before packing.
- Although you may leave your place in warm, sunny weather, the ports of call you may visit could be experiencing cold or wet weather. Be sure to pack warm clothing, jackets and rain gear. This is especially important if you are traveling to the Southern Hemisphere, where the seasons are reversed.
- The customs in some countries may dictate what clothes you can wear. Some may frown on wearing shorts in public, while others have laws prohibiting certain items of dress, especially for women. 
- Most cruise ships have formal dinners that require evening gowns and tuxedos. There may be other events at which specific dress is required.
Source: wikihow.com