For dodging/burning of contact prints I use masks: Rubylith and/or mylar with grease pencil. I place the negative on a light box. Then place the mylar of same size over the negative, then use a grease pencil to cover over areas that you want to dodge. Rubylith works better for those areas you want to burn in.
For exposing I tape the negative to underside of contact printing glass, then visually place the mylar on top of glass. Expose for 1/2 the time with this configuration, then remove the mylar and continue exposing. Its alot of trial & error but does give you some tools.