I don't have any proper training in Active Directory (rather I just fumble around and manage this network part time relying on experts in places such as this site), so I apologize in advance if these are really fundamentally silly questions. In other words, treat me like I'm 5. :)
I want to migrate away from a DC (DC1) because its old hardware and likely to fail on me to DC2.
In my domain I have:
-DC1: Win 2008R2, Active Directory domain Services role, DNS Role. Global Catalog and all 5 FSMO roles. Not a VM, its a hard box. DC1 has been the first DC in our domain for many years.
-DC2: Win 2008R2, Active Directory domain Services role, DNS Role. Global Catalog. This is a VM on newer hardware. I promoted this VM to DC a few months ago when another DC2 had a full hardware failure.
What I think I need to do is:
"Transfer" the FSMO roles from DC1 to DC2: https://support.microsoft.com/en-us/help/255504/using-ntdsutil-exe-to-transfer-or-seize-fsmo-roles-to-a-domain-control or https://www.petri.com/transferring_fsmo_roles
Upon success, spin up a new DC #3 (a VM on different HW than DC2), promote it as a another DC alongside the current DCs. Assign Global Catalog and DNS to this new DC3.
Upon success demote DC1 and decommission the hardware, wipe the drive, etc..
Are there any steps I am missing or anything else I should consider? I think the transfer is straightforward (I have also seized roles in the past when another DC failed outright) but I feel like I am missing some steps here. I'm also not onsite but doing this remotely so I don't want to make any mistakes and make for a long day talking marketing guys through commands.