My tips
Buy the best pole, slx ,
Do not use too shorter a length, I find slx 35 great because I can stand back further from the building, saves extra strain on neck.
I have trapped nerve in my neck, C5,C6
It s symptoms are shoulder pain , elbow pain, as the nerve runs through shoulder down arm to fingers.
Suggest if your shouldrds etc ache,Go to osteopath once a month,
Do stretching gently before work,
And some gentle stretches as a cool down after you finished last job of the day.
Mr B