amd64 FreeBSD Release 5.5 -> 6.2

[Duane Hill]

I have a server that, at first, required 5.5 because of the MTA that was 
running on the server. It no longer is running that particular MTA 
anymore. I need to upgrade the server to release 6.2.

Is it just a matter of changing the release tag within the cvsup file from 
RELENG_5_5 to RELENG_6_2, removing the contents of /usr/src/*, removing 
the contents of /usr/obj/*, and doing a clean cvsup?