The biggest tip I can think of is to play around with your gun and get the paint mixtures, and pressure so that the paint flows freely and you feel comfortable. That takes some experimenting as all paints are different, but when you've nailed it you'll know that when you're practising different strokes, any issues will be with perfecting technique not gun problems. And having a gun that is working well will make the learning process way less frustrating, and quicker and easier too.
Then it's just practise, practise, and yet more practise.