The best thing you can do is see a therapist who knows what he or she is doing.
The McKenzie exercises will definitely help, but how unloaded your training will need to be is individually dependent, and could be a case of working around the issue, or being completely unloaded other than walking for an initial amount of time.
Assuming it’s worse in the morning it might be an idea to put your socks on the night before, and use shoes you can slip on rather than bend down to put on.
Soft tissue release around the entire hip, low back will reduce referred pain via spasms etc.
And avoid long periods of sitting were possible, get up and walk every 30-45 minutes were possible.