I think we all have our own demons and we all deal with them in various ways that enable us to cope, some healthy and some not so healthy. No one can know for certain whether or not you're able to do this on your own or if it's worth it.
For me, personally, I needed the help of a counselor each time I tackled a MAJOR demon from my past. Not so with a few of the things I faced off against, mainly because they were on a level I was okay with. But when it comes to dysfunctional parental or family relationship stuff, I chose to have a counselor help me. I chose this because as a survivor of mental, emotional and sexual abuse, it helped me to guage my reactions and have a better understanding as to whether or not my thinking was on tract. In the past, I tended to find a way to place certain events or incidents into logical boxes in my head, which is a way of coping with a situation (not completely unhealthy, but...). What is bad about doing this is that I simply created an excuse for the offending party, such as, "Well, that was when he was a raging alcoholic - he didn't know what he was doing" or "Well, she/he/they did the best they could"...and what creating an excuse for their actions does to me is further victimize me! I can say now that it's okay to understand that yes, logically, so and so was an alcoholic at the time, BUT what he did STILL is not okay and it's okay for me to be angry at him and have my guard up in certain situations. I don't think I'm doing a good job explaining this, but hopefully you will get my message and that is that depending on the demons you're trying to deal with, you may or may not benefit from having a professional there with you.
My sister and I had a horrible, HORRIFYING, fallout a few years ago and it was BAD. I was so desperate to detach from her after telling her off, but it was very important to me that I detach without malice. IOW, I didn't want to harbor resentment and anger at my sister because that is counterproductive to detaching in a healthy loving way for ME. So, I sought a counselor and she really helped me to detach from my sister. we can hang out with family and for the most part we're okay. It's still uncomfortable in some ways, but I carry no guilt over this anymore and I can walk away knowing that I am preserving MY own sanity and protecting ME - which is of the utmost importance. I only saw the counselor for a few weeks to help me deal with the upcoming holidays and after until things settled down a bit. It really helped me a lot!
Best of luck on whichever way you choose to deal with this.