How to replace Lync Edge serverswith new servers(hardware)?

Our company have two Lync Edge servers, which are in one Lync Edge pool. Now, we plan to replace them with new  Lync Edge servers, new hardware. Thus, i would like to know: How to make sure the transition is smooth? Do you have any related article/KB?
I have some questions about this, for example:
1. should we create new Edge  pool for the new servers?
2. Can we have the four servers exist for some time before we remove the old servers?
Please advice. Thanks!

Deara Ben,
Thanks for your kindly reply on this issue. Sorry for the delay rely due to China Mid-Autumn Festival.
 I prefer to the second option--add new servers into the old pool, because i think this is easier than option 1. My implement and test plan is below, do you think it is feasible??
1. Prepare
1.1 Add two windows servers(A and B), configure external IP (Ex_IP_A and Ex_IP_B) and internal IP for everyone.
1.2 Add new servers into current Lync Edge pool, then publish topo and import the topo file into new servers
1.3 Install Lync Server components
1.4 Import and assign cert
1.5 Check service status, make sure services work well
2. Test
2.1 Open related ports for both new server, on internal firewall and external firewall.
2.2 Apply new internet IP for new server, configure " NAT enabled public IP" for both servers in topology builder(Pub_IP_A and Pub_IP_B) here, then publish the topo.
2.3 Configure NAT on external Firewall(Pub_IP_A<--->Ex_IP_A; Pub_IP_B<--->Ex_IP_B)
2.4 On the client, modify the local hosts file, 
add below DNS record(Pub_IP_A   Sip.domain.com ), log in Lync client then test whether 
server A works well.
2.5 On the client, modify the local hosts file, 
add below DNS record(Pub_IP_B   Sip.domain.com ), log in Lync client then test whether 
server B works well.

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