If you are right-handed, the scissors should be in your right hand, if you are left-handed, scissors go in the left hand.
The above comma is called a comma splice and is considered grammatically incorrect. What you have here is two complete sentences. The writer either needs to separate them with a period or question mark. or connect them with conjunctions like and, but, or, nor, yet, and so.
Another option is to separate them with a semicolon. You can use a semicolon to signal the reader that the two sentences are closely related to each other.
Bear in mind, however, that a semicolon is considered a soft period and not a hard comma.
Are semicolons your friends? Or do you run from them for fear of using them incorrectly? Or do they just bug you when you read them?
