Know that becoming a social worker means you must know how to advocate for yourself before you can advocate for others. That you must learn to deal with all your own hang ups and lay out all those skeletons in your closet on the table and deal with them one by one. Be open to a process of self awareness and self reflection, because to help others means that you must be strong yourself. Social work IS NOT FOR EVERYONE, because it's heavy on the heart and emotionally draining, but if you were meant to be social worker the world will need your strong heart and you will learn how to recharge from the emotional drainage.
A masters in social work isn't about grades and how well you do on an exam or paper, but how well you can self reflect and be true to the process of understanding the condition of others without judgement, prejudice or malice. It's about being sensitive to all the injustices out there and realizing that the perpetrator is almost always a victim. Social work is HARD if you want to do a good job and be a good social worker. If at any point in your masters program you feel like this isn't the line of work for you, get out immediately because your gut will tell you if social work is right for you, and as I've already mentioned its not for everyone and that's ok. Good luck.