Dough blender vs dough cutter?
It's really a matter of personal preference.  I like using a pastry blender, but not all pastry blenders are worth using.  It needs to be sturdy.  And you really don't want a handle that might rotate when you push down on the dough, so pay attention to how the handle is fastened to the blender.  When the dough starts to build up in the blender, just use your other hand to knock most of it back into the bowl.

The other method I was taught was to use two butter knives, one in each hand, and slide them against each other while cutting through the dough.  This method works, but it takes longer.

I haven't tried using a pair of dough cutters.  It should work, but it's going to require a flat work surface.  The other two options (blender and knives) work well in a mixing bowl.

Regardless of which method you choose, it's going to be a bit awkward until you get some practice.  Anyone with near-average dexterity should be able to master any of them with time.