I'm 32 and I recently learned.
Once you get over the quirks of starting the damn thing, it's quite difficult to stall while driving. It's only in danger of staling when you are moving the car very slowly, and when you are just getting started.
For me it helped to learn why the car behaved that way. Why it rolls back, why it stalls and what exactly I'm doing when I change gears.
I was looking at purchasing a used car and the one I had my eyes on was manual. So I took it out for a longish test drive, I spent an afternoon driving round and round a parking lot. Practicing starting and stopping, practicing shifting.
I knew the macanaics of what had to happen, I just needed to ingrain it into my brain so I did it without thinking of what needed to be done. I decide I want to accelerate and my brain deals with the how of that.
After the afternoon I was comfortable enough to buy the car. I could get it going 80% of the time. I had one public embarrassment that included staling like 55 times in a row in the middle of a busy intersection at Walmart.. on a Saturday. But... it's not like anyone recognized my car, no one had even seen it yet. I got red in the face, and drove away (skipped the shopping that day) after I got going again. So once that was over, I was good to go.
After 2 weeks it was second nature. I still stall sometimes but it's always because I'm doing something else while driving. Fumbling with my morning coffee while pulling out of the driveway, stall. It NEVER happens while out on the road.
So basically, once I understood what the gearbox was used for it was easy to know when to shift while driving. Learning to start was hard. But again, knowing why it stalls was key to keeping it from stalling.
Part of what was difficult was that when you are attempting to get the car going, and it's about to stall the car starts to shake a little. At that point I would panic and lift off the clutch, that's the exact OPPOSITE way of stopping the jumpy jerky motion. Rather, when you panic teach yourself to press the clutch IN, not off.