How to strictly implement my daily schedule?

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Some people including me are always apt to be lazy even though I know that I have a strict schedule to follow and something important to do. While I always try to find some excuses to delay my schedule at a maximum extent. I admit that I'm the kind of person who're always pursuing the life of "The First To Enjoy Comforts & The Last To Bear Hardships". The most key point is that I know it's quite unreasonable to have that kind of habit. I also know that it will influence my work efficiency and quality. Maybe there's certain problem with my passive attitude. Sometimes I compress three days' workload into one day to finish it. ^^ The result is obvious that finished work is not excellent, not that kind of perfect, and even occasionally with some stupid mistakes. In a word, I want to change this kind of life, and to form an active attitude to treat everything I have to face in the future. Do you have any good idea to share with me? Many thanks in advance. ^^