Back surgery for stenosis & spondylosis

Due to the pain I have with my lumbar stenosis and spondylosis I am having back surgery in August. The vertebrae slip when I walk and they are already bone on bone. The dr has suggested a surgery called "anterior lumbar inter body Fusion", ALIF. I'll be honest I am scared. The vascular surgeon opens me in the front , then my orthopedic dr pits in the cage, then later I'm flipped over on my stomach where robotic surgery will take out the disc. Have any of you had this surgery before?? Questions I have were you in a lot of pain, able to get up and walk soon after surgery, want to know what to expect????