Going clutch only lets you get a good feeling for where the clutch starts to grab. I also noticed for smooth shifts into 2nd-6th you don't really push the gas & let out the clutch at the same time it's more like leading with the clutch & following with the gas.
Your frustration level plays into learning it too. Regardless if you stall or not being relaxed helps you not rush through the movements.
If it snows where you live practicing in the snow helps some.
There is S, S# & I modes for the accelerator the I setting may be best to learn. When I borrowed my moms van she was having a hard time with S but no problem with I as long as she didn't accidentally lock the diffs instead.