Recording Acoustic guitar & Vocals together

I'm trying to figure out the best way to do this. I want to sing & play acoustic guitar at the same time and record it as well. I have (2) Shure sm 81's and a Shure KSM 44 mic. I know how to mic an acoustic and I get some great sounds. Now I want to capture my vocals all together. I'm trying to avoid the process of laying down the acoustic tracks 1st, then laying down a seperate vocal track. I want to do this the "old-fashioned" way and capture that "vibe and energy of singing and playing at the same time". I would luv to do this in stereo if possible. I don't mind the "bleeding" into the mics as I can use this to my advantage. Can someone with experience using this technique offer me some suggestions on mic setup and should I be using a particular type of mic (or mics). I'm playing around with this, but I really feel I need some advice from the "Pros" as I feel I'm missing something in the recording process. This is being done in my home studio ( not live on-stage). I would greatly appreciate some help with this technique, some proven and tried methods. I know there are plenty of links on recording just an acoustic, but not with vocals at the same time. Thanks.