Like with most selling jobs comes stress.
You're going to work a lot of hours -- if you're done with your work at 5 because you have a 9-5 you're doing something wrong.
But I will say the more work you put into it the more successful you're going to be.
The first weeks of training are intense i'm not going to sugarcoat anything you're going to be working and studying late into the evening. But like i said above, completely worth it as well as necessary.
If you can't handle stress or "crunch time" I would consider rethinking-- things that don't come easy are usually worth it.
I personally am one who likes to be held accountable for myself. My success as well as my failure. With this job I am accountable for both, which gives me an incentive to put that extra work in! Which can be both a blessing and a curse.
If you can't handle rejection or don't have thick skin I would consider another career path-- it would probably take me an hour to count how many times i've been told "NO" or to "never come back".
Just like with any sales job there are going to be cons, which is exactly why sales isn't for everyone. I would advise making sure it's something you're comfortable with before applying with any company.