How to renew SSL certificate in exchange server 2013 hybrid environment

I have hybrid environment with Exchange server 2013 CU8 and Office 365. Every thing was working fine but in coming few days public SSL was getting expired. so started working on it to renew it, and took the following steps.

1. Purchase New SSL Certificate from a Public Certificate Authority 
2. Create CSR on one on-premises Exchange Server
3. Upload the CSR on Public Certificate Authority site and create Public SSL against it
4. Download that certificate to the server from whom CSR was generated and install it on that server
5. Export that Certificate from that server and import it on all servers in the environment
6. Assign that Certificate to required Cervices (IIS, SMTP, etc)  
7. Replace the old Certificate with new Certificate in the Send connector of the environment
8. Replace the old Certificate with new Certificate on both edge servers receive connectors
9. Rerun the Hybrid configuration wizard to replace the old certificate with new one