A cool head is key, i mean ive played virtually all of my first season in snake and if you dont keep a cool head and you're panicking you wont get anywhere.
Next being smaller is a better advantage im 5"7 so that helps.
Getting as low as you can before diving and making sure that hopper and marker are above the ground otherwise you could get a hopper full of exploded paint.
Try to be aggressive when taking shots and moving up but you have to know when the time is right to go otherwise you'll be out before you peep out of your bunker.
And Flexible