P2V of Windows 2008 R2 SQL clustered servers

Hi

We are planning to do P2V for existing Windows 2008 R2 / SQL 2008 clusters hosts (In test lab we did it successfully). We concerned about a few points:

a) In case of failure / application issues we will revert to the existing production servers, in that case if the trust failed for pohysical servers then we can re add those hosts again to domain, but in case of cluster name trust failure, how can we correct it?

b) is there any known issues / precauations to be takes before converting clustered physical hosts to VM?

Thanks in advance

LMS