You do may have to work required overtime if a project or part of your work isn't completed. That can be very stressful and can crush people under the pressure.
Learning how to deal with other coworkers that will argue to you about your work or if they don't do their share. When this happens, it can lead to high tensions within your team, since you want to get along with them since you are most likely to be working on the same project. At the same time you don't want to feel pressured to do everything yourself.
I think what I am sensing is anxiety over the uncertainty of what is a big life change from student to working full time. It is completely understandable. Having gone through it many years ago and worked in probably a dozen companies (so far), the best I can offer is don't get overwhelmed by the details. Nobody expects anyone to ever have all the answers. Go into it with an open mind and can-do attitude. You can and will figure it out, but it will take time, just like it took me and everyone else who has made the transition. I personally relish change and adapting to new environments and with some practice and spirit of embracing the unknown, you can too. You've got this!