If that's all you can fit in then that will do but its probably best to have a more structured routine of interval training 3 x per week and 3 x weights per week (plus as much incidental activity you can fit in). Then again, I know a lot of people who have lost weight just by power walking. Although, your diet must be spot on to get you good results. I think you could probably lose weight by doing what you're doing but be very careful you are not overdoing the food. Set some realistic goals and if you dont achieve them maybe tweak the diet a little bit more. Still allow for a treat every so often though. As for your wobbly bits, only resistance training can help there. Try lunges, squats and nothing beats running for a good bum lift! Remember, you cant spot reduce one area but a combination of effective training and diet will help you become more toned. Hope that helps.