You can absolutly do your own alignment. It will take some time and an investment in a few tools but you can do as good a job, if not better, as any shop. Because you care.
Look thru the manuals at this site as a starting point.
http://www.smartracingproducts.com/Note: you can build an accurate repeatable "914 specific" string set up very inexpesivly, less than $10.
And for a few hundred $ more you can do your own corner balance.
If you are going to be changing suspensions, experimenting with "the best toe" setting, etc. it will pay you to DIY.
Ken