baratati

1. (+ instr.) to handle; to be good with
   Moj deda dobro barata računarom. — My grandpa is good with computers.
   Ona solidno barata engleskim i nemačkim. — She has a decent command of English and German.
2. (+ instr., of data, terms) to use; to work with; to handle
   Političari stalno barataju nekim čudnim ciframa. — Politicians keep bandying about some strange figures.
   Novinar je baratao proverenim podacima. — The journalist was working with verified data.

Takes the instrumental without a preposition: baratati alatom.