owners manual should give you the correct type of spark plug to use - these cars like the NGK products. Cost - should be less than $2 each - no more than $3...
Having a shop do this - labor is the big factor here - labor charges vary depending on where you live - around me it is typically around $45-55 per hour, but some have reported as high as $85 per hour, or more - usually in the larger cities...so yeah, you could easily save money doing it yourself (if you have tools) - plus, you get the satisfaction of having done it.
Changing spark plugs is not all that difficult, per se - but can be a little time consuming for a first timer.
Drivers side is usually the harder side - more things in the way - making it a bit awkward to get in there, but not impossible.
The biggest issue with the aluminum blocks is to make sure you dont cross thread when installing the new plugs. A little trick that I use is turn the new plug backwards (as if taking it out) until I feel it "pop" into the threads, then turn in - I do this by hand...put new plug into the plug socket (with a short extension attached for holding on to), insert in the hole, and thread in...it should go fairly easily - if there is resistance, stop, back it out, and try again.
Once it is threaded in by hand as far as you can, attach the ratchet and snug it down - do not overtighten! you only need to "snug" it - about a half turn after it 'hits bottom'
In all seriousness - I am only about 3 - 3.5 hours away from you (if you really are in Minneapolis) - if you cared to take a little road trip, I would be happy to help you through your first plug change.