If you’re a handyman, you can handle the installation of your dsl modem/router and splitter(s) yourself. You then configure your computer yourself, all the while enjoying yourself and without grumbling. You will find the manual for your modem and other practical details on this support website. Installing like this will cost you precisely nothing – except the odd drop of sweat.
If you have an internal telephone exchange and/or an alarm system, then a telecom installation is obligatory.