The road to managing huge sums of money starts with a few bucks

(The writer is a Reuters contributor. The opinions expressed are his own.)

NEW YORK, Oct 31(Reuters) - Every human being manages money, at least a tiny little bit of it. But there are a handful of people whose job is to handle massive, titanic, mind-blowing sums of it.

Vanguard Groups Rodney Comegys, for instance, oversees a cool $3.1 trillion. To put that number into perspective, only four nations on the planet have a GDP bigger than that.

But how exactly do you get started, on the road to managing such massive wealth? We talked to a few prominent money managers about their career beginnings, very far indeed from the executive suites of Wall Street.

Rodney Comegys

Global Head of Vanguards Equity Index Group

First job: Junior officer on a nuclear submarine

It was an enormous amount of training. For the first 18 months you go to school to learn about nuclear theory. Then you have shore-based training to learn how to run a nuclear reactor. Then you go to submarine school to learn how to drive a sub.

After all that, I reported on board the USS Archerfish. You are underwater for months at a time, so you are really disconnected from the world. Career-wise there are two things going on: You are leading people, and you run operations. So I helped lead a team of seven that took care of reactor chemistry. At the same time I had responsibility standing watch, and having oversight of the reactor while at sea.

I didnt really get claustrophobic, because those ships are bigger than people think. They are three stories high, so its like working in a factory environment. There was not a lot of communication we were only allowed to receive 50-word family-grams. Thankfully there were never any crises like in "The Hunt for Red October" or "Crimson Tide."

I think about three things from my time on the sub. I learned about great leadership. I learned about relationships, because you have to get along with everyone. And I learned the technical aspects of running a sub, how to break problems apart and solve them. After all, you are being given the keys to a $1 billion ship with torpedoes and a nuclear reactor. Thats a lot of responsibility for a 22-year-old.

Omar Aguilar

CIO of Equities, Charles Schwab Investment Management

First job: Fixing Volkswagen Beetles

I grew up in Mexico City, and as a high schooler with no money, I had to figure out a way to get a car. All of my friends had started to get cars, and I was jealous because I wanted to be one of the cool kids.

Mexico City was actually a big hub for Volkswagen Beetles back then. A big percentage of the worldwide production was made in Mexico, for Mexicans. They were everywhere. So a gentlemen told me if I helped him fix up some old Beetles, eventually he would give me one. That was my incentive. After about a year of working as a mechanic, I got my own 20-year-old Beetle with a leaky roof.

Back then there were no YouTube tutorials or anything, so you had to learn everything from older mechanics. It was very mathematical, being able to understand all the different engine parts and how they worked together. My biggest takeaway was trial and error: You try something, and it may work out or it may not. But it both cases you learn something, and move on to the next challenge.

I developed a pretty good intuition. If you gave me a 1968 Beetle right now, I would probably be able to fix it. But something like a Tesla, where everything is electronic, I wouldnt even know where to start. I have no clue.

Ramona Persaud

Portfolio Manager, Fidelity Investments

First job: Answering phones

The first job I actually wanted was at a dry cleaners around the corner from our house in Queens. I had just turned 14 and I wanted to make my own money. But I had prototypical immigrant parents for whom school is everything, so I wasnt able to do that.

It wasnt until my third year of college that I got a job for Morgan Stanley, which was just down the road. They needed someone to answer phones, and paid $10 an hour, which in 1996 seemed like a lot of money. I liked it because I could make money for textbooks, and get some studying done at the same time.

I noticed they were doing all their trade clearing and settlement on paper. As an engineering student, I offered to digitize their paper system into software applications that were easy to use and would reduce mistakes. I figured I would just learn how to code. My manager said go for it, and that was my introduction to the world of financial services.

Immigrant parents are famous for telling their kids what to do, and my dad really wanted me to be an engineer. But plot twists are what make life interesting, and I found that investing was what made my brain happy. I worked on my dad over the years, but before he passed away, he would still look at me with a raised eyebrow. (Editing by Beth Pinsker and David Gregorio)