Never done this before...

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I just started this yesterday and didn't do very well. This whole thing is new to me and I'm really not sure about it. I'm a big one to say that "I just don't have time" or "I'll do it later". Any advice on how after 15 years of this attitude I'm going to change?? I'm going to be 40 this July and I so badly want to put a swimming suite on again.