Thoughts on breaking into FICC sales as an experienced hire in late 20s?

I've been working in a non-front office, treasury/finance type setting for about 4 years, and a job post on FICC sales got me thinking...at least on paper, indirect experience like mine qualifies for the role, plus I'm just waiting on hours for my CFA charter, so I might actually have a shot at the interview. But I have a few hesitations:

1. First and foremost: am I underestimating the job description? Can 2-3 years in "a finance function in the financial services industry", even if back/mid office, + CFA really get you in as an associate?
2. I'm not 100% sure I want to do sales for my whole career. Am I too young to be leaving a hands-on role? Especially because I want to focus on the quantitative side - I'm wondering if I should go for analysis roles first where I can get a few more years of coding in. I know sales is technical, contrary to popular belief, but in my case I specifically want to maintain coding skills. I've been studying a master of CS part time.
3. Are the hours really 7am-6pm ish in Canada? For another year or so I will still have school (MSc), so I'd need about 1-2hrs per workday to study and not be drunk. I've been told FX sales is like 6am-7pm, and generally so far everybody's hours seem worse than the consensus seen on the internet.
4. Are salespeople 100% "on" during work hours, like sprinting to the bathroom and having zero minutes for lunch? Opposite to #2, I think I'm getting too old to be interested in a job where you have absolutely no breathing room.