Everything you are experiencing is par for the course. Using a strap ,( I actually bought one on amazon) was key lifting leg to couch or lowering it when getting up. Early on if you dropleg or bend it too quick you get a quick pain shot as a wake up call. All goes away as weeks progress. Don’t know where you are sleeping ,but I know I wedged myself into couch so I could avoid that quick bend or sudden movement first 2 to 3 weeks.