I've had left knee replaced, should have done it years ago. https://bonesmart.org/knee-replacement-surgery/
this website will provide you many ideas, tons of support
My doctor told me to loose weight, I found Dr Ken D Berry on YouTube. He taught me fasting, and low carb lifestyle. I've lost 30 pounds, feel great, never hungry. Fasting, it's not what you think, it's intermittent fasting, search for videos on YouTube.
Ice is the miracle aid for pain, I learned this with knee replacement, now use an ice pack often for pain.
You will do great, and fishing sooner than you think.
i forgot to mention, Donjoy Iceman, ice water circulation machine, a must have.