If there is an especially short time frame, then the problem the plan creates might happen before whatever good things the plan creates. If that happens, then the plan probably isn't a good one. If there is a long time frame, then the good things the plan creates would happen before the problems it creates. If this is the case, the plan probably is a good idea. If you know that the affirmative is going to make a certain answer, you might want to anticipate it and insert a point denying that answer.
Every disadvantage is like a chain of reasoning.
It starts with the link and ends with the impact. Like any chain, it is only as strong as its weakest link. You only need to break the chain at one critical point to defeat the disadvantage. Disprove link to your plan. The link take-out states that the affirmative plan doesn't actually cause the problem the disad presents.