I started riding a road bike in 2013, and prior to that I had ridden literally around 20 miles accumulative my entire life. When I started riding, I rode with dudes who meant well but assumed I knew what I was doing, so I developed some bad habits.

Now I've ridden over 3000 miles and have decided to switch from combo spd/platform pedals to spd sl pedals and I freak out. I think I have too many bad habits and don't know which one is most important to break first. (The ones listed below are the big ones for which I get made fun of the most)

A) unclipping both feet at the same time when slowing to stop (normally I'd kick the pedals to the platform side and pedal to the intersection/traffic light)

B) not having a "dominant leg" that I choose when stopping and starting

C) not coming off the seat when stopping, and not standing over top bar while stopped, I've learned to stabilize myself on my tip toes, which is not very stable at all

D) not starting over top bar and hopping up on my saddle once I get going (a cheap pair of bike shorts ruined this for me in the beginning when the giant chamois got stuck on the saddle and I fell over)

E) irrational fear of falling over- like, literally terrified

Any advice would be greatly appreciated.