There's a few things you can do to make disruption a bit easier below.
Run in a full squad and coordinate your activations of the keys: It's easy to get overwhelmed with all of the Elite enemies that charge down your keys. running with veteran players and/or a coordinated squad can alleviate a lot of the stress and increase your odds of hunting the enemies down early
Check the weapon Metas and see how people online like to build their guns: Rhino is a great warframe, but the demos often, if not always, have a disruption bubble that they emit which will strip your Iron skin. If you're looking for Pure B E E F you can try Inaros or Hildryn.. Looking at heavier hitting weapons might also Aid you in your endeavor. A fully modded catchmoon with the battery augment usually gets me through Disruption pretty well. Find a weapon that suits your style and see how veteran players like to build it online.
Practice: Disruption is not easy. all new missions take practice and this one is no exception. Dont get discouraged if you lose. We've all been there. Just keep trying at it and you'll get it eventually.