I would suggest that if you are truly ready to give up alcohol abuse you seek medical advice.
This way you can gauge how likely it is that you are going to experience severe symptoms like seizures.
You might also get some insight into your disease, which can help you to process your reasons for quitting.
I would caution though, that you should go to a doctor or even a counselor who is known for addiction therapy.
Not all medical professionals really understand it, and you don't want to end up listening to someone who brushes off your addiction as though it was nothing.
If you can't afford a doctor, then at the very least make sure someone is going to keep an eye on you. Join Alcoholics Anonymous if you can.
The alcohol withdrawal duration is awful, but at the end of it you'll feel better than you have in years.