Upgrade Prestashop website 1.7.6 to latest 1.7.8

Project is to make an upgrade of the website from 1.7.6 to the latest 1.7.8 prestashop version. Upgrade will be done on a copied environment. After upgrade, new customer and new order will be copied to the new environment. There is only one website, with only a few modules. I'm looking for someone with a strong experience in prestashop. Please make an estimation, during chat, I will give you the URL so you can have a better look and make a better estimation.
I'm looking for a long term relationship, I have several websites to upgrade and new websites to build.