If you start your bi/multilingual website project from a vanilla install, then we can take care of the WPML Installation & Set Up (https://studio.envato.com/explore/wordpress-customization/4045-wpml-installation-set-up) on your behalf.
If on the other hand, there is an existing website in a singular language and the decision has been made that this site needs to become bilingual or perhaps even more than one language needs to be added, then it usually is a lot better (read: cheaper in the long run) to first assess whether there are going to be any obstacles on the road.
That is the reason that in those cases we always recommend to perform the WPML Installation & Set Up Assessment.
During this Assessment, we take the whole site (frontend and backend) under the loop and look at WordPress setup in general, selected Theme, selected plugins, any potential plugin/theme conflicts with WPML, database, files structure, SEO and speed.
We finialise the WPML Setup Assessment with a Report that by and itself is a very valuable document that can be used to improve the site, whether you decide to hire us or not.
The Assessment Report also includes an estimate on what we think the investment is going to be to get the site functioning fully bi/multilingual and usually we include additional services for example for content duplication or implementation of the translated content.
We can indeed take care of everything except the actual translations :)