Originally Posted by
Larsenex
With this particular shifter shown above, can I shift gears using my right index finger while 'standing up' and ascending a sizable hill?
No. The trick is to ease up on pedal pressure for an instant, shift, keep pedalling lightly until the gear change is complete, then back to full pressure. You never stop pedalling, just ease up on pressure. When you get the hang of it it takes about half a second.
On really steep hills this can be difficult/impossible, so you should get in the right gear before the real steep part.