The more you play, the better you get.
Also, I've said this a thousand times- don't worry about deathbombing. The window is less than human reaction time in all games outside of IN and possibly PCB Reimu. Instead, try to recognize positions where you can't dodge the bullets and bomb before they hit you. If you lose track of what's going on, again, rather than flailing around hoping to get lucky, just spend a bomb to avoid the death.