Hi Janet
I have heard of this trick before. I've done it a few times although it feels utterly stupid to do that - I read it out loud to myself as I don't have a flesh-and-blood writer's group nor the time, hopefully one day! But I've still missed things.
With my initial posts on TNBW, I was trying to get it perfect. I soon realised that no matter how many times I've read a piece, nits still slipped through. I still try to minimise any mistakes a much as I can before I post to get value from the reviews on site, but have long since accepted that I would always miss a few mistakes, sometimes really silly ones.
What I now found that really works for me is to post a chapter and then review it before I publish it. That seems to work too as it has the "TNBW look" when I read and review other writers on site, so my mind automatically switches to reviewer mode and I do pick up nits I could have sworn weren't there!
But yeah, even so, some buggers still slip through the net.
My goal is to get published, so the final draft I might very well lock myself somewhere private (and for those with kids, you know where that's going to be LOL) and read it to myself, but hopefully I'll find someone who I can read to, who knows?!
Janet R