Yes, Mossback, the "managers" from the House will present the case, like prosecuting attorneys do in a usual court trial - but they don't have the power that prosecuting attorneys usually have. The rules for the process of the case are set by none other than Mitch McConnell, who may well be able to orchestrate the unfolding of the case exactly as he sees fit.
So, while the managers may have many of the functions of district attorney in a trial, it is McConnell who holds most of the power of a district attorney. The managers will be actors in the play - but McConnell will write the script. That's why Speaker Nancy Pelosi is not sending the Articles of Impeachment to the Senate right away. That would forfeit what little power the House has left at this point. She wants leverage to force McConnell to play fair, by forcing him to set the rules before the Articles of Impeachment are sent to the Senate.
-Joe Offer-