As you may have already discovered, the Lhasa Apso is one of the most fun-loving and mischievous breeds around. Because of this, it is important that you start training your pup as soon as possible. You can actually start training him at 8 to 12 weeks of age. Because of your pup's curious and mischievous nature, you need to socialize him and start obedience training as early as the day you bring him home. This will make it much easier for you to successfully train your Lhasa Apso pup that your house is not his personal toilet and that he needs to hold on until he is taken outside.
The task at hand is simply to teach your pup that the only place he is allowed to go do his business is outside in the yard. Moreover, you can train your pup to go in one specific area of your lawn, helping to keep his mess all in one spot. Bear in mind, when you take your Lhasa Apso pup outside, the only thing he is likely to be interested in at such as young age is running around, playing, and doing anything except going potty. However, you should never scold or punish your Lhasa Apso when he has an accident in the house--these little guys don't like being yelled at and intimidating any dog into compliance is counterproductive in the long run.
One of the most important aspects of potty training your pup falls on you. You need to keep a very close eye on your dog so that you can start picking up the signs he gives indicating he needs to go outside. These may include going to the door, sniffing at the carpet or floor, whining, squatting, and lifting his leg--among others. This can help you pick up on the fact he needs to go and could save you from any number of accidents. You also need a few "training" supplies.
Along with these, you need the time to spend training your pup and the patience to see the training through to a successful conclusion. You might also want to stock up on extra cleaning supplies for the inevitable messes your pup is bound to leave until he gets this whole potty training thing down pat.