I don’t use a comb. I use the Oster brush like this:
https://www.smartpakequine.com/pt/oster-mane-and-tail-brush-8857
Really, any human or horse mane/tail brush will do as long as it has wide rubber-tipped bristles. This is just the one I personally like.
I also use this to brush out the tail:
https://www.smartpakequine.com/pt/carr-and-day-and-martin-canter-silk-mane-and-tail-conditioner--80
Now, this is not an every day product as it’s still silicon-based so can be drying when overused, but it’s MUCH better than Show Sheen. Show Sheen feels atrocious after using this stuff. It’s a little more expensive, but you use it sparingly and for clinics/shows, so it’s really not too bad.
The tricks to not ripping out the hair are to using the spray and letting it dry. That’s what gets a lot of people. They spray the tail and then immediately start ripping at the tail, which causes a lot of damage. Wait for the spray to dry, then hold onto the tail and start brushing from the bottom without pulling on the top (you pull against your hand that’s holding the tail instead of pulling on the actual hair.) There shouldn’t be much real pulling either because the brush should glide right through. You work your way up the tail slowly, takes 10 minutes and bam, show-ready tail.
Best tail photos I could find. 99% of the time his tail goes untouched except for picking sticks or hay out of it.