Don't worry. I'm 18 and have an 84 944 as well. I have had it 6 months and it has never been to a mechanic.
I think it is a great first project to dive into. just take it slow and take a lot of notes and pictures.
I'm sure you have been to clarks garage and that is a great resource.
YouTube - Porsche 944 Turbo Water Pump Change - part 1.wmv
That is a great video on how to do a WP job.
Jackson