Good luck using a 24" auger on your 2025. I had a dirty hand tools model 100 with a 9" auger on my MT125 (25hp, 17 pto hp). It definitely took agile reactions to keep it from corkscrewing into the ground. Could only dig about 4-6" at a time, then lift to clear the hole, otherwise not enough power to pull it up. Did about 40 holes with it after I learned "a system" about how far I could go and at what speed.
Part of the lifting power problem was that I could not use the outermost holes on the arm (closest to the gearbox) that's where you get the most strength to lift. I had to use the second one closest to the tractor in order to get the auger high enough. The MT125 sits a lot lower than your 2025, so you may not have an issue with going with an outer hole.
For "undoing a corkscrew", make sure you move your pto lever (the one for mid /rear pto) into neutral position, otherwise you will also be fighting against the hydraulics. Also make sure the electric pto switch is off, and the engine is shut down. I used a large pipe wrench and a 3' length of 2" steel pipe for a cheeter bar. Usually a 1/4 to 1/2 turn popped it loose.
For planting trees, I found it easy to auger 3 or 4 holes right next to each other in a circle pattern, then just shovel out the remaining dirt left between the holes. Only going 20-24" deep, there won't be much dirt left in the hole.
When I sold my 125, the DHT PHD went with it. I found it to be a valuable tool, for both posts and planting trees. (I did plant over 200 trees/shrubs using a hand held auger). I'll never do that again! When I just purchased my XG3025, getting a PHD was a requirement. I still only went with a 9" auger. No stones/rock here, and no roots where I use it, just hard, hard, clay soil.