The linkbuilding can be done to some extent by self-help, but one should know as much as possible, and also invest the multiple. Better to entrust the optimization of the site to professionals. They will take exactly the right steps to make the site more successful and more visited.
An amateur linkbuilding could hurt your site more. It is not worth investing in expensive quality sites, when we do not give them the right promotion. On the Internet, more successful are those pages that have a better promotion, in front of the technically better ones, but they are not quite visible on the Internet.
If you want to make sure that you make the best of your website promotion, link the linkbuilding to real professionals.