You will definitely know if you overdue it. Stretching and moving and keeping the muscle strong is helpful. My daughter will use warm water and move her foot in that to keep it moving. We do PT exercises three times a day per her PT. Here is a link to an interesting article--

http://www.neurologynow.com

Click on the March/April edition, then to the article Exercise Rx for Nerve Pain.

It doesn't specifically address RSD but it did help motivate us to keep up the exercises even when we didn't want to.