My mother takes Oxycontin XR (10mg) and supplements it with vicoden 5/500 or oxycodone 5mg (vicoden without the acetametaphin) as needed throughout the day.
Often during the days she can make it with just the vicoden/oxycodone 5 mg. At night she takes an 80mg oxycontin so she can sleep.
Oxycontin comes in a variety of doses, 10,20,40,60,80 mg. The greater the mg dose, i would assume the harder it would be to function.
You might want to try the 10mg XR and supplement it with the vicoden...