Unfortunately it is not always easy to match schedules with other people. I was unable to walk Chandler for a few days, and it showed. Although I had taken both of Chandler's foster parents on a walk with him (without my dogs of course) and showed them the proper techniques for keeping him from pulling on the leash, people do not always remember to follow instructions.
I say again, it is HARD WORK to properly train a dog. If you are unable or unwilling to put in the time and effort it takes, you will not achieve the goals you set out too.
BE CONSISTENT!!! Being consistent in dog training is one of the most important things. Think about it...if it's ok to get on the couch when dad is home, but not when mom is home, you are not being consistent. The dog will be confused and may get yelled at by mom because she was not aware dad let the dog on the couch. This is a simple example, but holds true.