Hi Laura!
I don't post often, but I briefly check the forums about 2 times a week. Your post caught my attention. I also have a 21 month old son and have plenty of fat to lose. I also have a 4 year old daughter. I'm 30 years old. Anyway, I've lost 40 lbs since I started working out after having my son, but it took me 15 months. Right now I'm at a plateau and have to work harder to get past it. I still have about 30 more to go.
I don't know much about the beginner Cathe DVD's. They are very good I'm sure. When I started out 15 months ago the beginner DVD's were not yet available so I did "The Firm" workouts. I was not able to do Cathe's yet. If the beginner ones had been available when I was 40 lbs heavier I would have definitely bought them. I have a lot of Cathe DVD's, but if I were to pick one favorite it would be the IMAX 2/Cardio and Weights DVD. I can't do IMAX 2 in its entirety. I usually do a premix which is just the first half of the workout. The choreography is simpler than some of Cathe's other step workouts. The music is also great on these workouts. I use a 4 inch step height and modify the moves which are too hard. I can hop but not too high, and when I get too tired I just lift me heel and only hop slightly. I also love the Step Blast/Step Jump and Pump DVD. Step Jump and Pump has nice premixes in which you can eliminate the hi/lo floor aerobic sections if it's too much impact for you. That's what I do. I also really like Power Hour. It's all weight work for muscle endurance, not really using heavy weight. Of course I lift much less than Cathe is able to !
I do a good mix of cardio and weights, but more cardio than weights, probably 70% to 30% ratio. I hate dieting so am not following one. I'm not sure if this is great advice or not. I hate the lo carb foods out there and some of them make me sick. SO, after much trying different things lost all this weight so far by eating normal foods, just really watching the quantity, and exercising 3-5 times a week. I've also heard that eating 5 smaller meals a day is better than 3. So I've been trying that. We'll see how it goes.
Keep trying! You will learn the choreography eventually, and it is so gratifying when you do. Then you can really let loose and work hard while having fun.
You can preview clips of all of Cathe's workouts on this site. It's a great idea.
Take care and stay in touch!
Liz