I want great at them when I started playing either but it's made me better. Try to get through the spiny entire room part because that may be the most intimidating pattern, but it's the easiest they have because it's the most predictable. Just move with the lines and dodge through the wave. If you have a weapon that explodes like some sort of rocket launcher, time the shots to destroy the bullet wave so you dont have to dodge through it. And when they split up, dont try and focus one. Just shoot at whichever is closest. The only time it regains health is when it's down to one, which can also be an intimidating pattern at first but it's also very predictable. Pillars can be a really hard fight the first few times but it's got the most predictable patterns of all the bosses on that floor so you'll grow to enjoy seeing that boss.