This is not the same as learning in the shop, but because of the cicumstances, we'll have to do the best we can. Check out a few really good You Tube videos 

          "Best 3 way switch explanation ever"

       Then have a look at       "Four way switching explained -How to wire 4 way intermediate light switch"

             Call me if you have any Questions

             Email me at     Robert.Hembrough@nbed.nb.ca