I think it depends on the cat. Morley, my fearless wonder has no trouble walking on a leash. Scout, my scaredyboo will likely have a heart attack.

When my dog was still alive, Morley would come out with us in the courtyard and would walk with my dog until we exited out of the compound. He'd wait for us and walk back with us. When my dog died, Morley was beside himself not having that routine anymore so I had to take him out for a walk every night. He follows me so I stopped using the leash.

Having said all this, I think it's easier to start them as a kitten rather than on an adult cat. But you can always give it a try, he may catch onto it!