Doing it yourself is not impossible. You'll need to buy an alignment tool, for around $125-150. A couple of tape measures, a large flat surface, and you're set.
It takes some practice. The first time you do it will take all day. And it will be wrong. And you'll have to do it again. Pretty much the same thing for any new skill.
I do my street/track car 12-16 times a year. It would be foolish for me to take it to an alignment shop every time; too expensive and time consuming. I also do my other vehicles about once a year or so. Only because I have the tools and the know how.
But, if I was only going to do it once, or even once a year, I'd take it to a good alignment shop. You could get about 3 good computer alignments by a pro for about the same money you'de spend on tools. Of course, shopping for new tools is a always fun.
