Knitted too many stitches

How-to Questions
1

I’m knitting my friend a plush penguin for her birthday, and one part of the pattern said to knit 18 stitches of black, 8 of white, and 18 more stitches of black. BUT…I accidentally misread it, and thought it said 18 for all of them. Now I have way too much white on the row…What should I do? I’m too far into the project to start over…

(It’s on reagular flat knitting needles, if that changes anything.)

2

You wouldn’t have to rip it all out, would you, just go back to where that section begins, take out the row to where you’ve got 18 black and 8 white sts, then switch to the black.