A lot of practice is a good idea.
At least with the professional hunters I've hunted with, a whole lot of walking wasn't needed. I think they all could have made a paraplegic successful.
GRF and I have hunted with the same guy in the Eastern Cape. I requested that I hunt and stalk and not shoot from the vehicle, or near the vehicle. I got my wish. Most nights my legs were cramping and feet sore. I was unsure if I could go the next day. But rest and a little ibuprofen got me ready for the next day.
Due to back injuries I am not the most mobile person. But the PH kept learned my limitations and together I got to where I needed to be.
Hunting Africa will spoil you and change you forever. Do not be surprised if you immediately want to go again.
GRF, weren't the shooting sticks bamboo or something similar?
