Petronel is right--you have come to the right place.
I had stage 2 SCC ten years ago. Just like you, it was on the left side. The doctor told me that the tumor was encapsulated. I thought that meant it could be removed in an outpatient procedure, my tongue would be stitched up and I could go, skipping tra-la, merrily on my way. Little did I know.
All I had was surgery (hemiglossectomy and free flap resection) and it was extremely successful. The pathology report said that radiation and chemo were not warranted.
What has your doctor told you about the procedure?
This question is going to sound really strange, but are you in the US? If so, you might want to reschedule your operation because of the 4th of July. I'd be concerned that the OR staff might not concentrate 100% (annoyed that they have to work the holiday, or distracted by last-minute planning.
That you're scared is understandable; I'd be worried if you weren't. The best suggestion I can offer is stop researching this on the internet--all you're likely to find is worst case scenarios.
I'm not sure if I've answered any q's for you. Send me a private message. I don't mind.