I think what folks mean when they are talking about "pulling spurs" is removing the outer sheath.
I DO think when the outer sheath is removed, the spur is
sensitive. I've had roosters knock the outer sheath off (several times) and they indicate some discomfort but not to the point I personally feel they are dying of pain.
Do you have access to a dremel or cut off tool? This is a very efficient method of shortening spurs, the heat from the wheel also will cauterize, so any bleeding would be minimal. Dremel is what I use.
Hacksaw will work too, you'll need a helper.
Process of twisting off the outer sheath - "spur"