I think that your decision may just make itself as you think about your life. Only a few weeks ago, I really had no intention of resigning. For all the reasons you mention and I was not concerned because I had grown to know that the church had no power over my life.
But then I kept seeing others who were actively resigning and pressing hard to achieve that for themselves. I listened to others who spoke movingly about the sense of closure and relief that it brought them to distance themselves in this way from a unsavoury organisation that they had no part in now. I found out that there are tens of thousands of resignations worldwide every year. I found out that I could resign via e-mail email@example.com
so did not even have to write a letter.
So I had to think about my family. For me, the first step was to order a cup of tea and drink it in front of them. I knew they would notice. It made it easier then to just drop into conversations that I had gone to another church. I gave them lots of little hints before coming out and saying that I was going to resign. And do you know what happened? My mum rang me up a couple of days later and started giving me her membership number etc so I would send the email in for her too.
My point, go for what you wish for. Others may just be waiting for that act. I agree with the others, let it come from you. Don't live your life influenced by what other people may think or speak about you.
And I am certain that when the admin is finished for me, I will feel so much better than I can even now imagine. BTW, for my mum the whole process took 3 weeks.
Also, although the church will keep us as members until we are 110 years old in their stats, the staff in the office at Salt Lake and the individual bishops and SP etc receive a very powerful message when someone, and so very many of us, does/do resign and follow it through.
It is a good lesson in life to stand up for what we believe in and to stand against what we don't believe in anymore. And all that will depend upon your reasons for leaving, which you don't mention. Have you checked out http://www.mormonthink.com
and other sites that present the info about the church? Do you have a belief in God? Check out the links at the bottom of my post.
You will grow to know what to do, I am sure. All the very best and I hope you will be at peace with your decision. Take Care of yourself.