Don't aim for perfection. If you trying to get better at something - let's say you want to not lose your temper with your kids. Don't set the goal of changing completely, because then you are likely to fail and give up altogether. Try to do a little better every day. If you find yourself yelling, just yell a little less, stop sooner and be less loud. Review your small changes at the end of the day and celebrate your small success.