Sometimes, we overthink things and this looks like one of those times. When I first looked at the pictures, I thought wth is all that?
What Simm said, with the pipe, or if you don't have one layin around, use a GOOD fencepost, tho a post can be heavy and hard to slide. Use something long enough to stick thru and then some, just remember where it is... especially if you have another animal behind the one your working. The pipe can get moved forward and then the worked on animal can suddenly shove it back. Listen to Dave..he's done a few...
Might not break your leg but can sure flip you arse over bellybutton, and it's REALLY hard on shins.
Can't count the # of times I and Dad worked polled hereford, brahma and later, me with beefmasters with just a couple of pieces of pipe. Finally got smart and made a trip over to the Preifert dealer... $$$$ but easier.
No Backs work good on bigger calves, most cows and heifers but I saw a BM bull tear one clean off it's mount. He was a handfull and I was kinda glad when he broke his pecker and left in a trailer..
If your going to work many like you intend to do, go ahead and build yourself a raised walkway on the outside of the alley/chute. It gets old climbing up on board rails and even pipe rail to work, keeping you balance.
DO be carefull leaning way over in there. They can rear up faster than you can get out of the way.
Get one of these if you don't have one already. Guarantee you are going to drop something down in there and keeps your hands and forearms out of risky places.
About $10..cheap insurance.
I have used nose tongs when dehorning. Not as pretty and shiny as the one I see posted tho. Gave them away when I sold the place. Guy I gave them to had no idea what they were or how to use them even tho he had kept cattle for years. shrug..........