Moving AD and service accounts

Hi Guys

Maybe not so much a SP question ...but anyway...

I’ve “inherited” a SharePoint Foundation installation that runs FBA and Search Express on a 2-tier

• WFE - Server A
• SQL- Server B

The front-end Server A act as the AD service and Domain controller and the service accounts that SP is installed upon.   

I would like to move the AD to Server B  

Can someone point me to a how-to? – and tell me the heads-up – if any?