Upgrading from 8ft starter board to 6ft fish?

Hi everyone, I've been lurking these forums for a long time and heeded everyone's advice on starting out surfing with a longboard (8' wavestorm), but now I'm itching to move on to a shorter board! I've been doing some research and I've been leaning towards a quad fish around 5'11" - 6'2" based on my height/weight (5'8", 135lbs). Surf in my area is usually 2-6ft (La Jolla Shores, San Diego), so I think a fish would be perfect for the waves.
I was wondering if I could get your opinions on what skills should I have before trying to upgrade boards? As of now I can consistently pop up on 3-4ft waves (any bigger and I pearl big time) but mainly I just ride them into the beach, I can't go along the green face yet...I feel like my board is so big and clunky that it doesn't react to turning well, so I want a shorter one, but still want buoyancy, and I don't care about fancy tricks yet - that's why I am eyeing fishes and not shortboards.
1. What do you all think about me changing boards now?
2. If I do change boards, would 5'11" fish be okay to learn on? or should I go bigger with 6'2"?
Thanks for answering!!!
I was wondering if I could get your opinions on what skills should I have before trying to upgrade boards? As of now I can consistently pop up on 3-4ft waves (any bigger and I pearl big time) but mainly I just ride them into the beach, I can't go along the green face yet...I feel like my board is so big and clunky that it doesn't react to turning well, so I want a shorter one, but still want buoyancy, and I don't care about fancy tricks yet - that's why I am eyeing fishes and not shortboards.
1. What do you all think about me changing boards now?
2. If I do change boards, would 5'11" fish be okay to learn on? or should I go bigger with 6'2"?
Thanks for answering!!!