Driving a manual transmission vehicle is not something that can be conveyed over the internet very well. The best advice I could give has already been given. Practice. That's what it boils down to.
Much of the clutch work is done by feel, and that is not something easily learned except through experience. It's kind of a Zen thing, I suppose. The more you drive your car, the more you will be in tune with it. If you pay attention to it's little quirks, you will become a better driver in general.
Good shifting is less speed than it is rhythm. If you are calm you will shift much better than if you are nervous, regardless of whether you are racing or trying to drive smoothly in traffic.
That was the reason for most of my stalls when I started driving a manual. I would think about stalling because I didn't feel confident with my shifting or was nervous. If you stay focused on your shifting, rather than fixating on negativity, you will probably notice improvement in your shifting technique.
Sorry if this wasn't exactly what you are looking for. It's more philosophy than technique, but technique is best learned through experience and personal training if necessary. Either way, I hope this helps in some fashion.
