Training a cat to walk on a leash

Greetings.

Every day it doesn't rain, I take my ferret for a walk, either with a leash
in the city or without a leash in the forest. As I mentioned in a previous
post, I'm thinking of getting a cat too, and was wondering about the
feasibility of it joining us for the walks.

I have seen some people taking their cat for walks on leashes. I've tried
to do the same with my grandparents' cat but didn't have much success. Can
all cats eventually be trained to do this, or is it something only certain
felines take to? If the former, what's the best technique of teaching
them? I plan on getting a kitten, so I'm hopeful that teaching it from an
early age will help.

Also, is it at all feasible to take a cat for a walk in the forest without a
leash, or will it run off or get stuck up a tree?

Regards,
Tristan

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