yourself.
the main reason that you will want to build links yourself is that allowing them to build naturally can be a slow process, especially in the early going. in order for people to start naturally linking to your site they have to find it themselves. you can speed this process up by building a few links yourself. once the process is started and you are getting a few visitors you can stop but in the early days you will want to kick start things by building your own links.
the other reason that you are going to want to build links yourself is because in highly competitive fields the ones that 