Regards the final approach setup, not sure what others were taught but we would use the known threshold elevation and cross reference the altimeter to set up a normal-ish approach angle from a reasonable distance out, which would give normal final speeds and power settings. The picture on finals would look different depending on the slope of the strip (i.e. if it was steeply sloping, the illusion would be that you were too high because of the runway aspect), and then obviously the change in aircraft attitude in the flare would be greater than normal.
That would be followed by keeping power on to make it up to the top, and then parking sideways!
Another possibly confusing factor is not having any useful horizon reference due to being surrounded by big hills, therefore some good old 'performance flying' would be needed - known power setting, then adjust the attitude with reference to whatever was out the front (hillside etc) until the performance was right - reverse engineering compared to 'normal' ops.
Add in to that the non-availability of go round options in many cases, plus weather and high DA effects - hats off to those hardy souls who do or have done it full time!