Bobbing and weaving begins with a slip; for example you slip inside a left lead.
Do it this way; slide your left foot forward and to the left, placing your wt over the left leg. Then slide your rt foot to the rt and put your wt on the rt foot; thisb should carry your wt low and to the rt. Or. as he leads a left, drop wt to your rt leg, let his left go over rt shoulder, step left w/left ft, slide body over it--- this should keep body low.

This is basic as hell- pm me and I'll run it down in detail.