Why would you need to work harder? Longer, prolly, simply because it'll take more than 6 months to lose the weight. So just do it till it's done, and evaluate if you want to go another time or switch to a different routine. Losing fat is about eating correctly while working out. The actual specifics of the workout aren't usually the determining factors. The diet is.
Donno about arthritis. You can search the forums and see if someone has asked or you may need to start a new thread if noone comes in here to answer you. However, I'd guess that it'll mostly be an individual thing and you'd be the best gauge of what you can and can't do. Try something and see.
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