you can change your own head, it's not for everyone.
if you tend to be hands on can follow instructions & are patient, you can get your questions answered, this site will provide a lot of support.
if you have never done anything like this, and don't crave a project, i am sure you will get several referrals for a reliable tech from your area
you will get a lot of respones, i think, during the week. not that many of us respond on weekends