Personally for me I don't push it too far past about a 6-7 on the pain scale. I push through some pain but if you go much further you have to "get ahead of the pain" with medication which is HARD to do with crps. Doing something (desensitization) is better than doing nothing, but letting the pain get too out of control can cause severe muscle spasms, swelling, things that the body will do in response to such severe pain and then, you end up being unable to do anything.