I would get an alignment, but wait a couple weeks after the install. If it's especially bad you'll be able to feel it pull. The new parts will need time to settle and "break in".
the way the rear adjustments work, I doubt you'll be able to get it close once you taken it all apart.
I just did coils in my car, and was waay off when i put in on the machine. that was 2 weeks ago, and its still settling.... but they are coils