In my case, the procedure was much less complicated as I didn't need the leads to go through the spinal canal but rather along my sacrum and coccyx. There is a trial period in which the unit sits outside and is 'plugged in' via the leads that, yes, are sticking half out/half in your body. Look I know that might sound gruesome to some but please... we're talking about chronic pain here... it was NOTHING. A cinch... it worked, it's in now and giving me great pain relief.