To go forward:
On my dad's Mahindra 4110's 12x12, you have to be at (or come to) a complete stop, push in the clutch, move the F/R lever to Forward, then let the clutch out while giving it a little throttle.
With my HST, I lightly push down with my right toe.
To go backward:
On my dad's, again, come to (or be at) a complete stop, push in the clutch, move the F/R lever to R, then let the clutch out while giving it a little throttle.
With my HST, I lightly push down with my right toe.
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Both tractors require the selection of range, so I excluded that from the above. However, even that's easier with my HST. I select from Low, Medium & High while stopped. My dad's requires selection of both Range L-M-H and Gear 1 thru 4.
My tractor also has cruise control, so if my right toe gets tired

, or if I want to maintain a set speed, I can move the CC to
any forward speed I want.