Newbie! Need to lose 20

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Hi all! I am new to MFP! I am 32 - newly married and a mother to 1 beautiful 8yr old daughter. I have been on every diet out there and have only had success with Atkins (I am not endorsing them...just stating my very own personal opinion) - I maintained my weight for over 3 yrs until this year - I sorta fell off the wagon and lost most of my motivation. I truly believe success starts with making up your mind FIRST - that you're going to achieve, setting goals, and somehow finding the motivation to keep going. Trying to decide on which method to take to achieve my goal ~ this holiday season has been tough to stay on track! I am 5'5" current weight 145 looking to achieve 125 and maintain!