We have documented the ways you can install Odoo yourself, on your own server:

https://www.odoo.com/documentation/master/administration/on_premise/packages.html

https://www.odoo.com/documentation/master/administration/on_premise/deploy.html 

It is not trivial for everyone to do this successfully, mainly because there are a lot of conceptual skills needed, facility with specific commands, configuration files to manage and finally - multiple technology stacks to setup and be familiar with.

If nothing on the graphic below makes you nervous, then you have the skills needed.  

If not, Odoo Partners can help.  Find them at https://www.odoo.com/partners