Bring it on Jillian

I've been steadily working out for a couple months with no real results because I'm not good at keeping up with it. I've had Jillian Michaels 30 day shred for a while but after 2 days I was in so much pain I just gave up. Now that the muscles have been worked a little from my non-rigorous routine I figured I'd give it another shot. Today is day 1, it was rough, but I got through it and my legs don't feel so stiff, wobbly, but not stiff. Anyhow, this morning after breakfast I was 185, I usually fluctuate between 178-185. I'm hoping to be 165 in 30 days. I'm 5'8" so that's a healthy weight for me and should put me in a size 8/9(I'm a 12 now). We'll see. I'm goin to post weekly on my progress just to keep myself motivated. Below is a picture of me Pre-work out.