How to install motors into a Grizzly or Enco Milling CNC?

Hi all!

I am new here but am extremely interested in transforming my bench
Drill Mill machine into a CNC. There are many questions which I plan
on getting answered in a near future, but the one I have not been
able to answer is how to adapt the motors to the handles? Should I
dismantle every fitting and then adapt the gear or sprocket? Or is it
only necessary to take out the wheel and mount the gear or sprocket
into that? If this is so should I cut a three prung into the gear or
sprocket assembly so that it binds with the fixture? What is the best
way of doing this without damaging the actual machine? Thanks for
your
help!

JIQ