In gyms in the US it's hard because you have to switch. I had a small gym, so I held pads for 7 years with 4 fighters. all above 70 kilos, one 200 pounds of molten muscle who competed in the UFC 2x and all over the world. I'm going to tell you, I was in my 30's when I took to training full time and those years too Years off my elbows and shoulders. My elbows especially. If I had smaller guys, mai pen rai.
I'm pround/ humble to say I was the best thai pad holder in the region. People used to come to me to get pad work done. I had numerous Thais and other known fighters look at us training and say, you pad holding good. You train in thailand? That felt good and validating but it didn't come overnight, nor did I want to be one. An injury sidelined me after only 13 fights. Yes I did train in Thailand for 2 months. Not much but enough to learn some fundamentals especially how they hold pads.
7 years of imitating the best in the world hurt me physically but eye wise, I could see things coming from a mile away, the only problem is when I had a couple of fights, I fought like a pad holder. My defense was impeccable but my offense, well, lost me those fights.
Unless you are a fighter, you should be gentle with smaller people. You aren't winning any fights just training. work your form and don't be a jerk. If you are a trainer and have fighters you should be holding pads for them. They shouldn't be holding pads while training for a fight much if at all. If you are a small guy, just tell the person, you are killing me, can you go lighter and you work some defense.
Everyone gets the deer in the scope look and attitude when they see a bag or pad. If you want to go hard and no one is available to meet your needs, there is nothing better than a heavy bag that swings and there are plenty of tools out there for boxers to work with.
Oh and for positioning the pads, there are plenty of youtube videos to help with pad holding and combos. hundreds of thhem.
Everyone wants to get 5 rounds with the pad man. He can't do it all in the west. If you want a full time pad holder, join a gym, become a top fighter or go to thailand or get privates. It's just our reality.
Karuhat in the free videos online didn't hold pads but worked on movement. Unique for a thai trainer, I'd guess. Very effective in a private session. You can't expect that in the west.
In BJJ it seems like everyone wants to be a 'teacher' because it confers rank or seniority. It is becoming a TMA mentality except for heavy competitors or MMA fighters.
Pad holding for me was like a sculptor with a hammer and chisel to craft the statue I envisioned. But I was limited in my time.