With dedicated training for 3 months and a fair amount of time playing every week you'll be able to, but as a new person you shouldn't expect it imo.
Naturally when I say this to friends, it's with every intention of supporting them through it. Friends wouldn't leave friends to fend for themselves
But the point I was trying to make, without getting bogged down in details, is that people should come to the game with every intention of paying their subscription fee for a few months at least before they're in a position where they'll be able to make enough money per month to pay for it via ISK and PLEX.
I know so many people who hope that in the time they have a trial account, or after paying a single month's subscription, that they'll be able to work hard and save up enough to pay for the next month. I guess some people may achieve that goal, but those few are a very small percentage of the people who try, and I dare say they have to play the game as if it were a second job to achieve that.
My personal philosophy is: Once I feel guilty about not logging on to earn ISK, because I'm falling behind in getting my next PLEX, then it's time to stop playing the game.
I find that serves me well as a general "It's about time to take another break" alarm.