How to change configuration of eth0 without restarting other interface (CentOS, Redhat)

I need to setup a static IP for eth0, my server has multiple network interfaces and I don't want to bring any of them, except for eth0 down.

I found lot of guides like http://ift.tt/1G3IEsw but all of them ends with "now restart networking" or "now reboot"

I can't reboot this server, nor I can bring down eth1 even if it was for a microsecond. How would I change eth0 config without touching other interfaces?