Having integrity and a clear conscience will keep your self-esteem up and self-esteem is pivotal to personal development! Do not cut corners, make excuses or give yourself other reasons to feel like you are not giving life your best effort. All of those little things will add up to a weight that will burden you with guilt and stop your success dead in its tracks, not to mention keeping you from getting a good night sleep.
Take an audit of yourself, and own every part of it; even the bad aspects that you may currently have. To really grow in your personal development, you need to both understand yourself and love yourself for who you are. That doesn't mean that you shouldn't want to change the bad aspects; you should. But loathing yourself will only hamper your ability to change.
To stay true to your goals, enlist the help of a friend or join an online support group. It helps to have support from people who are going through the same thing. You will be surprised how much an "atta boy" or "way to go" can lift your spirits and keep you motivated through rough patches.