One of the causes of frustation or burn-out it that we set unrealistic targets for ourselves. Set a small or comfortable target for each day, get the job done, and you get a sense of achievement after that. This gets you going the day after, and next, and next......If you set a really big target, and fail to meet it day after day, you'll get into a vicious cycle that eats into your enthusiasm and confidence level and you'll be physically drained out as well. As they say, Rome wasn't built in a day ! Good luck and take care.........