Not at all.
Get yourself a muslin bag. Noble Grape will likely just give you one. Then, crush all the vienna, munich, and specialty grains and put them into the muslin bag.
Heat some water in your brew pot to 152ºF (as per above recipe) and steep the grains for 30 - 45 minutes. That should be enough for the starches to convert. Then, remove the bag and set it in a colander to drain over the pot. After that, just add the DME and remaining water to start your boil.
The amount of water you use to steep (mash) isn't important as long as it's enough to cover the grain bag. You'll have to jockey the temperature knob on the range to maintain the 152ºF, but such is the way of a partial mash.
The vienna and munich malts are going to be necessary in the mash because they'll provide the diastatic power needed to convert the starches in the other specialty malts.