Install Let's Encrypt SSL on Ubuntu Server (On IP)

I'm looking for an experienced sysadmin to install a free Let's Encrypt SSL certificate on my Ubuntu server On IP not hostname.

Key Details:
- Type of SSL: Let's Encrypt Free SSL certificate
- Server Access: Full root access available
- Linux Distribution: Ubuntu

Ideal Skills and Experience:
- Proficiency with Ubuntu Linux
- Experience installing Let's Encrypt SSL certificates
- Strong understanding of server security

Please provide your estimated timeline and cost for this project.