Post op blues is a reality - be prepared for it Here is an article for DH.
You may want to have him watch a video of a TKR, you just had the ends of your bones sawed off, hammered, screwed, cemented, bent and straightened, soft tissue cut, then pulled back to see your knee.
Here are some photos you can show him,
TKR surgery - WARNING: real life photos If that is not enough, he can watch this, warning graphic live surgery, and not for the faint hearted.
broken link removed: https://video.google.com/videoplay?docid=-3347931048322867705#
Here is a cartoon of a TKR if he does not like the graphic photos.
broken link removed: https://www.edheads.org/activities/knee/
You are recovering from a major surgery, not an athletic injury.
Leg lifter strap, use the strap to help bring your leg into the bed before you scoot back, once you are in bed thant scoot to a comfortable position.
Heel slides and leg lifts, you can have DH help or use a towel or sheet as KarriB has suggested. Your leg should start waking up soon.