Help from a High Profile Site
To look for free quality backlinks on your own, there are many resources that you can use. For example, you can contact the webmaster of sites that are related to the topic that you are working with. They will gladly promote your product in a tasteful manner with a backlink placed in a text that is related to your industry and subsequently your product. The result is that your backlink will appear in a place where many, many people can see it when they read the high quality content on the site. The benefits to this method are that you do not have to write any content yourself, and someone else handles a lot of the work for you. You just need to provide the link if you want to build quality backlinks. This particular handling of backlinks is particularly good if you run into a high profile site that gets a lot of traffic, and this site is willing to help you.
Problems with a High Profile Site
On the other hand, this site will often not let you control exactly how your backlink is displayed. Because the site is run by other people, they will want a big say in making sure that the backlink does not disturb their visitors and make them think that the advertising is a nuisance. You might not agree with the webmaster or moderator on the method that is used to present the backlink, even if you will still value the backlink in the long run.
On the other hand, you can use a quality backlinks service to make sure that you get the free quality backlinks without the risk that most people incur when they venture out into the territory of SEO marketing on their own. After all, this quality backlinks service will know just when it is appropriate to post a backlink somewhere. They will not post backlinks where backlinks are not welcome, if you hire a reputable company and you look for a list of where they will post. After all, there are some sites that will be perfectly willing to post your articles containing backlinks. These will need to be well-written, with good grammar and spelling as well as some content, but you will get a free pass when it comes to article directories and blogs.
On the other hand, leaving posting on forums to the service that you hire. It is very easy to antagonize a forum if its users are not used to the presence of backlinking. If the links are not placed tactfully, the moderators of the forum will try to make sure that your links are not archived at all. Your work will be wasted, and you will not be allowed on the forum again.