i've never done a strand test with anything and i self-relax and self-color
i also wash my relaxer out in the shower so me and safety-guidelines just aren't the best of friends
just make sure to up your protein for first few months afterward and soooooooo cut back on heat after first coloring.
I'd definitely do a strand test and a skin test.
I understand impatience, but is it really worth gambling your hair & skin on being unwilling to wait an extra day? Esp. the first time using a product - heck the first time coloring, period? Allergic reactions to hair dye are a bad, bad thing.
Sounds like a bad idea to me, but I hope everything goes okay.