After installing the Tein CS [without adjusting] on my GS it went straight to the paint shop for new paint/exterior goodies. I'm getting the car back today and I'm wondering if I go ahead and get an alignment done tommorow before leaving for the beach Saturday morning, will I need to have the alignment done again after adjusting the suspension lower?

i would because you removed the bolts that adjust camber toe and caster when you put your coilover on

The suspension is done & I'm getting an alignment before leaving for the coast tommorow. My question is... when I get back and adjust the suspension lower, will the car need another alignment?

You should align it again after you change the suspension at all. If you change the height often you should invest in a lifetime alignment. Firestone offers them.

Anytime the suspension is modified, (especially ride height) caster, camber, and toe are altered. I would recommend a 4 when alignment ASAP.