Grab gear uphill and clutch your feet. It is the basic skill of truck drivers. When the power of the car drops. Step on the clutch to take off the gear. Slam the throttle. Step on the clutch and engage the first or second gear. The action should be consistent.
Especially for heavy vehicles, two foot clutch is required for both upshift and downshift, especially when the second foot (after entering the gear) is lifted, it should be stable. When you are particularly skilled, half foot clutch can be used for upslope downshift, which can be completed in an instant: downshift - oil explosion - downshift - lifting Clutch - oil supply. The whole downshift process will not reduce the power and transmit smoothly, with less mechanical impact.
