Hello Aeiouy,
Can I give you some advice? Well, I am going to any way. :)
I did the "tell my mother how I really feel about all this" thing. I told her that I did not believe that the WTBTS were God's organization, that I did not believe the WT magazine had any truth to it, that I did not believe that the Bible was the word of God.
And I immediately regretted doing it. My mother said she didn't want to "argue" about it and just shut me off. Then she said some nonsense about my not really doubting God's word but that I wanted to do immoral things blah blah blah.
See, the JWs don't want to know what doubts you have or why you are leaving. For them you are obviously a person lacking integrity if you would dare turn your back on the "faithful slave".
I think it is better to avoid this conversation altogether.
I also do not like the idea of "sticking it to the man" by growing a beard. You will just be informally shunned and the gossip mill will start and there will be "concern" over how "weak" you have become.
My advice is don't do anything. Don't talk about it. Just start living your life. In six months to a year things will look differently.
The elders are not going to accost you. They will make shepherding calls. Be polite and be very sorry that you are missing the meetings. They aren't really going to try to "save" you.
There is no reason for this to be dramatic. It will better for you mom if it is not dramatic.