I worked through most of med school. I worked a lot my first year, almost as much my second, a little my third and very little my fourth. The decrease in work was more because the economy was taking a dump and my consulting opportunities dwindled... this is unfortunate, because I probably had more time I could have worked, especially 4th year.
Year one I averaged perhaps 15-20 hours per week, some weeks putting in nearly 40 hours. This was consulting, so nights and weekends of course, not regular daytime work hours.
I attended all classes, and studied enough to do well. I had plenty of hobbies, some of which I couldn't pursue because there isn't much money in medschool obviously, even when working, and some of which I continued to enjoy during school. I even picked up a new one about half way through school. There was even time for some golf when weather, classes, work, and family aligned.
Yes, I was married with children. I worked so the wife didn't have to. Thankfully I had the ability and opportunity to do so.
I say this not to brag, but to tell you that it is possible. That is the question you posed. It is easy? Possible for you? Only you can answer that. If you find med school generally easy it might not be a problem. On the flip side, I had plenty of classmates who studied day and night relentlessly and still struggled. There weren't enough hours in a day for them to study enough to really do well, let alone have hobbies, a significant other, children, or any semblance of a life, let alone work.
So who are you, really? You should know yourself well enough to make a fair guess at how you'll do in med school. Did you find that you could always ace a test, no matter how "difficult", if you really wanted to? Could you do that without putting in as much effort as classmates struggling to meet the average? Or were you always struggling to beat the average enough to keep your med school hopes alive? Did you laze your way through school with a minimum of study and pretty darned good grades headed for a different career, only to later find out medicine was where you were called, or have you always had your eye on medicine and have been pounding the books since the day after highschool graduation trying to achieve that?
It's possible. Definitely possible.