As you progress with electrolysis, you'll run out of big, mature follicles at some point (100-120 hours?), and the electrolyst will be dealing with immature follicles, many just waking up for the first time. The body seems to have a reaction to losing all that hair, trying to wake every possible follicle to replace the pelt!
These immature follicles will be shallower, closer to the surface, and smaller. My electrolyst switched to a smaller probe (#3, with extended insulation and a smaller live tip), and a lower current setting for thermolysis. This has a huge impact on discomfort. I can still (barely) feel the probe insertion, and the pulses of heat from the probe being energized, but it is nothing like when I started out. Clearing hairs on the upper lip is now quite manageable, and sometimes I don't even sneeze when she works near the nostrils!
Hair is also sparser, so the work in a session is spread across a much larger area of skin.
TL; DR - It gets easier. Much easier.