Yes, in order to install a lifeline you need to be trained and informed.
UNI EN 795:2012, Appendix A, recommends that the manufacturer recommends that anchor devices be installed only by competent persons or competent organisations.
It is necessary to have technical and administrative suitability (Article 26 of Legislative Decree 81/2008 and subsequent amendments) and it is the client's responsibility to verify the technical suitability of the company or self-employed worker to whom he entrusts the work.