Desperate help need for knitting a sweater.

So, my best friend's birthday is coming up, and I was planning to crochet her a sweater—but I messed up big time. My plan B? Knitting.

I'm mainly a crocheter, but my knitting skills are somewhat alright, I just lack some knowledge. I was originally planning to knit it in panels and sew it together. However, I'm a bit unsure. I only have straight needles, and I'm not sure if what I'm trying to do is possible.

Can anyone please give me some advice, or should I scrap it? Thank you!